HPHV Shunt regulator v1.1d Instruction Manual - BasAudio.Net

HPHV Shunt regulator v1.1d 

Instruction Manual 

V1.0

HPHV Shunt Regulator v1.1d MASK 2002 

1 About the HPHV shunt regulator.......................................3 

2 The circuit............................................................................4 

3 Before starting.....................................................................9 

4 Mounting and soldering the components ......................11 

5 Decision time.....................................................................16 

6 Warnings............................................................................19 

7 Connecting the regulator .................................................21 

8 Testing and setting up......................................................22 

9 Parts list.............................................................................26 

10 Schematic .......................................................................27 

v1.0 27-12-02 page 2/27


1 About the HPHV shunt regulator 

The HPHV shunt regulator is a very high performance circuit designed to provide a 

low impedance power supply for a tube circuit. The circuit is optimized for a constant 

phase response within the audioband as well as very low noise. 

In order to reduce the stress that tubes face during startup, the regulator slowly 

raises the output voltage when starting. Full (sonic) stability is reached after about 5 

minutes. 

The shunt regulator has two parts: the constant current source (CCS) and the shunt 

(regulator). The CCS provides a constant current to the shunt and to the load. In 

effect this creates a high impedance (isolation) between the raw dc supply and the 

shunt/load. 

The shunt regulates the voltage supplied to the load by adjusting the current through 

the shunt. The error amp measures the voltage at the shunt/load and compares this 

voltage with a reference voltage. If the two voltages differ, the error amp will cause 

the shunt to conduct more or less current. This will (re-)set the voltage at the 

shunt/load to the correct level. This happens very fast, in fact, much faster than any 

audio signal. 

Due to the topology, the shunt regulator provides a very short path to ground for the 

load. 

I ccs (I shunt + I load ) 

+ 

CCS 

I shunt 

V reg 

I load 

RAW 

DC 

voltage 

reference 

+ 

+ 

- 

error amp 

shunt 

load 

ground 

v1.0 27-12-02 page 3/27


2 The circuit 

The shunt regulator basically has two parts: the constant current source and the 

shunt. 

2.1 The constant current source (CCS) 

The CCS consists of T2 and U2. U2 (TL431) is a shunt regulator (in a 3 pin device) 

that will always try to keep a constant potential (voltage) between its anode and its 

reference. It does this by adjusting the potential (voltage) across itself (anodecathode). 

T1 and R4 form a CCS (high impedance), so the cathode of U2 is free to move and 

well isolated from the raw dc supply. The cathode of U2 sets the bias of T2 (gate 

potential through grid stopper R5). So by setting the voltage across itself, U2 sets the 

bias of T2 which, in turn, sets the current through R16 & R6. As U2 will try to keep 

the voltage between its anode and reference constant, the current through the CCS 

is kept constant. This provides high (AC) isolation between the raw dc supply and the 

load. In order to function correctly, the CCS needs about 20VDC across it. 

The TL431 has a reference voltage of 2.5V. Let’s assume R16 is set midway (50R). 

The total resistance of R16 & R6 is 50R + 20R = 70R. U2 will adjust the current so 

that it sees 2.5V between its anode and reference. In this case, it will set the current 

at 2.5V / 70R = 0.036A (36mA). R6 limits the maximum current at 2.5V / 20R = 

0.125A (125mA). 

2.2 The shunt 

The shunt consists of T4 1 (the shunt) and U1 (the error amp). By setting the gridpotential 

of T4, U1 tries to keep the potential (voltage) between its two inputs the 

same (it acts on the difference between its two inputs). 

The inverting input is connected to a voltage reference, composed of T3 (CCS) and 

U3 (shunt reg). The CCS allows the cathode of U3 to move freely and provides a 

1 Mosfet shunt option. 

v1.0 27-12-02 page 4/27


high impedance (isolation) between U3 and the (regulated) DC rail. The voltage 

reference is set at (approximately) 7VDC, so U1 wants to see 7V at its other (noninverting) 

input. This input is coupled (AC via C2 and DC via the voltage divider 

R19/R18/R3/R17) to the output of the shunt reg (V reg ). 

If V reg changes (causing unequal potential between the inputs of U1), U1 will react by 

adjusting its output. The output of U1 sets the bias of T4, controlling the current 

through the shunt (setting V reg ). The AC coupled input (i.e. error signal) is amplified 

about 100 times by U1 (the DC gain is set with R8 and R13). Since U1 (OPA655P) 

has a gain-bandwidth product of 240MHz, it is able to handle the signal well beyond 

the full audioband, causing very little phase shift within the audioband. 

DUE TO THE SPECIAL (DUAL) POWER PINS/CONNECTIONS OF THE OPA655P, 

DO NOT SUBSTITUTE THIS DEVICE WITH ANOTHER OPAMP. 

The low-end response of the regulator is determined by the C2 and R15. The 

combination of 1uF and 470K causes a -2dB point below 1Hz. Due to the long RCtime 

of C2 and R15, V reg rises very slowly after applying power (prolonging tube life). 

At higher frequencies (about >150KHz), the gain of the amp is reduced by C13 so 

that the opamp always has ample feedback (providing linearity at these higher 

frequencies). In effect, the amp is rolled of with –2dB around 375KHz. At even higher 

frequencies, C4 becomes dominant and provides a low impedance path to ground (at 

these frequencies, the gain of the opamp is severely reduced by C13). C13 also 

damps any potential (HF) oscillation. 

v1.0 27-12-02 page 5/27


Simulated response 

v1.0 27-12-02 page 6/27


Due to the high gain-bandwidth product of the OPA655, the regulator has a very 

constant phase angle within the audioband (20-20kHz), The phase-angle is never 

more than 2 degrees. I find that excellent phase response is essential to (sonic) 

imaging and stability. 

This kind of performance can only be achieved by using extraordinary components. 

The Burr-Brown OPA655 is a very special amp, definitively never designed to be 

used as a error amp in a shunt regulator for tube circuits, but it sure does a great job 

(BB OPA655 datasheet): 

If you want more info on the OPA655, download the datasheet from the Burr-Brown 

site: 

http://focus.ti.com/docs/prod/productfolder.jhtml?genericPartNumber=OPA655 

R8, R13 and C13 form the feedback network for U1 setting the (DC & HF) gain of the 

error amp. T5 and R21 form a CCS that force the output of U1 into class A (better 

sonics). R1 provides isolation for the output of U1 from the gate capacitance of T4. 

v1.0 27-12-02 page 7/27


U4 and its associated parts provide U1 and U3 with clean DC rail. L1 and L2 provide 

HF isolation from the raw dc supplies. 

In order to monitor the current through the shunt, the voltage at test point I can be 

measured. The shunt current (mA) equals this voltage (mV) divided by 10. In order 

for the shunt regulator to work correctly, the shunt current should be at least 0.2 

times the load current. 

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3 Before starting 

Before you start soldering, first you have to take care of a bug in the PCB design. 

There is a trace on the PCB that really shouldn’t be there (sorry about that ..). 

If you look at the picture below, you’ll see which trace has to be cut. You should use 

a sharp hobby knife for this. Carefully slice out a 1mm strip of copper. 

Use a multimeter (continuity) to check that there is no connection between A and B 

(i.e. that the trace has been cut). 

To double check things, after mounting R6 check with a multimeter that there is 20 

Ohms between points A and B (and not a short). 

v1.0 27-12-02 page 9/27


The second thing that has to be taken care of are the ‘ventilation holes’below the 

heat sinks. Due to the coating that’s applied to the PCB, the holes are covered with a 

thin film, and need to be opened. A toothpick works great. 

v1.0 27-12-02 page 10/27


4 Mounting and soldering the components 

It is essential to use a small, clean soldering iron (preferably temperature adjustable) 

and quality solder. Cut the leads to size before soldering (if you cut them after 

soldering you could stress the solder connection). Inspect every solder connection 

very carefully (preferably with a magnifying glass). 

Some of the solid state components are very sensitive to static charges. 

Ground yourself and the soldering iron; place work on grounded (metal) 

surface (aluminum foil is fine). 

This is from the Burr-Brown OPA655 datasheet: 

Due to the very tight layout of the PCB, you should assemble the components in the 

following order: 

1. Mount C13 (10pF). This cap is mounted on the solder side and soldered 

on the component side (the position is marked on the solder side). Make 

sure that the leads are short enough so that the opamp can still be 

mounted. 

v1.0 27-12-02 page 11/27


C13 mounted on solder side 

Leads soldered on component side 

2. Mount and solder the resistors: 

a. R1 30R 0.25W 

b. R4 10R 0.25W 

c. R5 100R 0.25W 

d. R8 200R 0.25W 

e. R9 20K 0.25W 

f. R11 120R 0.25W 

g. R13 20K 0.25W 

h. R15 470K 0.25W 

i. R17 4K7 0.25W 

j. R21 100R 0.25W 

k. R22 11K 0.25W 

l. R2 300K 0.5W 

m. R6 20R 0.5W (check resistance between A and B: 20R) 

n. R7 300K 0.5W 

o. R10 1K6 0.5W 

p. R12 10R 0.5W 

q. R14 220R 0.5W 

r. R18 150K 0.5W 

s. R19 150K 0.5W 

v1.0 27-12-02 page 12/27


Resistors mounted and soldered 

3. Mount and solder the following parts: 

a. D1 1N4007 check correct polarity 

b. D3 9.1V zener (marked 55C 9V1) check correct polarity 

c. D8 15V zener (marked 55C 15) check correct polarity 

d. U1 OPA655P check correct orientation 

e. C6 100nF (marked 104) 

f. C7 10nF (marked 103) 

g. C11 100nF (marked 104) 

h. C14 10nF (marked 103) 

i. T5 2SK369-V (marked K369) check correct orientation 

j. T1 LND150 (marked SiLN D150 check correct orientation 

k. U2 TL431 check correct orientation 

l. R16 100R trimmer (marked W 101) check correct orientation 

m. T3 2SK369-V (marked K369) check correct orientation 

n. U3 TL431 check correct orientation 

o. C3 33uF 16V check correct polarity 

p. C5 10uF 16V check correct polarity 

q. R3 5K trimmer (marked W 502) check correct orientation 

r. C10 2.2uF 16V check correct polarity 

s. U4 LT1085 check correct orientation 

v1.0 27-12-02 page 13/27


t. C9 22uF 16V check correct polarity 

u. C8 15uF 25V check correct polarity 

v. L1 1mH 0.29A (marked 102) 

w. L2 2.2mH 0.2A (marked 222) 

Small components mounted and soldered 

4. Mount and solder the heat sinks. Mount both, flip the PCB over and solder 

both the sinks. If you can adjust the temperature of you soldering iron, put it 

at about 350C. 

5. Now carefully mount the Mosfets T2 and T4 (IRF830). Be sure to put some 

heat sink compound between the Mosfets and the heat sink. Mount with 

M3 screw and nut, then solder. 

6. Mount and solder the big film caps, C1, C2 and C4 (1uF 630V) 

v1.0 27-12-02 page 14/27


Completed HPHV shunt regulator (note the heat sink compound) 

7. Check all the solder connections (use a strong light and a magnifier). 

8. Check the polarity or orientation of all the semiconductors, electrolytic 

capacitors and trimmers. Recheck (its very easy to make a mistake). 

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5 Decision time 

It’s time to decide how you’re going to use the shunt regulator: 

1. Mosfet shunt 

2. Tube/mosfet cascode shunt 

1. Mosfet shunt 

The mosfet shunt is simple. All you need to do is place and solder the jumper on the 

solder side marked ‘JUMPER FOR MOSFET SHUNT’(between [C] and [A]). In this 

case the Mosfet will handle all the shunt power. 

Due to the size of the heat sink, the maximum Mosfet shunt dissipation is 10W. 

You can calculate the dissipation: P shunt = V reg * I shunt . I shunt depends on the load 

current, and should be at least 0.2 * I load . So if the voltage and current that you need 

aren’t very large, a Mosfet shunt will suffice. This will be the case in most preamp 

applications. 

v1.0 27-12-02 page 16/27


2. Tube/mosfet cascode shunt 

If you need more shunt dissipation, then the tube/mosfet cascode shunt option 

should be used. In this case, the Mosfet only handles the bias of the shunt tube V bias 

(much less than V reg ). The tube will handle V reg minus V bias . Because they are in 

series, both the mosfet and the tube carry the same shunt current (I shunt ): 

I shunt 

I shunt 

V reg 

no jumper 

V bias 

With the tube/mosfet cascode option, maximum dissipation depends on the 

maximum (plate) power rating of the shunt tube. 

For example, say we need V reg =450V and I load =80mA for a power amp. I shunt should 

be at least 0.2* I load ; lets use 40mA (0.040A). P shunt = 450 * 0.040 = 18W. We could 

use a triode-strapped EL34 as a shunt (EL34: max. 25W anode dissipation). 

According to the curves of a triode-strapped EL34 (with 450V anode voltage and 

40mA anode current) the grid is at (about) –48V. This bias will be provided by the 

Mosfet, which is in series with the tube, so the anode voltage of the EL34 will drop to 

about 400V. With 400V and 40mA, the grid of a triode-strapped EL34 is at about – 

45V. This will be the bias of the Mosfet (sort of like an auto-bias cathode resistor). 

The Mosfet dissipates 45 * 0.04 = 1.8W; the EL34 dissipates 405 * 0.04 = 16,2W. 

v1.0 27-12-02 page 17/27


Be sure to put a grid stopper resistor (100R) directly at the socket of the tube. 

Mount the shuntreg as close as possible to the shunt tube. 

For low noise, be sure to use DC for shunt tube heater (I do not recommend 

using a IHT as a shunt tube). Do not float the heater supply, but connect to 

ground or (better) raise the heater about +20VDC above V bias . 

Make sure DC heater power is applied before RAW DC (allow shunt tube to fully 

heat-up). 

If the grid biases at less than –20V, the grid may be connected to G0 (else 

connect the grid to G1). 

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6 Warnings 

As this is a high voltage circuit, you can get a serious jolt (or worse) if you touch the 

shunt reg while powered is applied. The heat sinks aren’t isolated, so they can be at 

500V. 

IF POWER IS SUPPLIED TOT THE REG, DO NOT TOUCH IT. 

USE A SMALL ISOLATED SCREWDRIVER TO (CAREFULLY) ADJUST THE 

TRIMMERS. 

The circuit combines high voltages and very sensitive solid state components. A very 

tricky marriage, indeed. During the development of the circuit many solid state 

components were destroyed (they blew up and gave their lives to high-end progress). 

That experience has helped to make this version of the regulator completely stable, 

but be very careful when testing and setting up. 

Check out the notes on the circuit diagram (page 27). 

DO NOT POKE AROUND A LIVE REGULATOR WITH A PROBE. 

It’s very easy to slip, make a short and destroy some (very expensive) parts. 

If you need to do a measurement, power down the regulator, wait 10s for all the 

caps to discharge, connect the probes to the regulator, set the meter(s), apply 

power to the regulator and measure. Repeat for each new measurement. 

If the output is shorted, (obviously) V reg will go down to ground. C2 is (still) charged 

and (still) has a potential of V reg across it. This causes the top of D3 (and the noninverting 

input of the OPA655P) to be driven to a potential of –V reg . Luckily when this 

happens, D3 acts as a kind of fuse and will ‘hold’the potential at –0.6V (protecting 

U1). This causes C3 to very quickly discharge though D3. 

v1.0 27-12-02 page 19/27


DO NOT SHORT THE OUTPUT. Should this happen, D3 will probably blow 

(protecting the OPA655P). D3 will have to be replaced. 

The components and heat sinks used have maximum ratings. These should never be 

exceeded. 

Do not exceed the maximum voltages of Raw DC (500VDC) and V reg (470VDC). 

Do not exceed the maximum CCS (5W) and shunt dissipation (10W). 

To calculate the CCS dissipation: P = (V RAW DC – V reg ) * I ccs 

To calculate the shunt dissipation: P = V reg * I shunt 

ALLOW FOR GOOD VENTILATION OF THE HEAT SINKS. COOL RUNNING 

COMPONENTS LAST LONGER. 

The maximum load current is 100mA (I ccs = 125mA; I shunt = 25mA). Since V reg is 

max 470V, max load dissipation is 470 * 0.1 = 47W. At this setting, the 

maximum shunt dissipation is exceeded: Pshunt = 470 * 0.025 = 12W. If you 

need this much power, the tube/mosfet cascode shunt option must be used. 

DO NOT OPERATE THE REGULATOR AT WORKING CURRENT WITHOUT A 

LOAD. 

If this happens, the shunt will have to handle ALL the current (I ccs ), exceeding 

the maximum dissipation of the heat sink. The heat sink will probably overheat 

and components will fail. 

The IRF830’s can dissipate a lot of power (75W), but only if properly heat 

sinked. If you need more power for the CCS and/or the shunt, you must use 

bigger heat sinks (or use the tube/mosfet cascode shunt option). 

v1.0 27-12-02 page 20/27


7 Connecting the regulator 

The regulator is connected to a (unregulated) +15VDC supply (50mA), a 

(unregulated) RAW DC (HV) supply and the load (shunt tube option connections not 

shown). 

RAW DC IN 

+15VDC 

Vreg OUT 

+ + + 

RAW 

DC 

+15V 

DC 

GROUND 

LOAD 

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8 Testing and setting up 

In order to test and setup the regulator without harming it, you must follow the 

next instructions exactly. 

If testing the regulator with power applied, always use probes that you can 

clamp (hands-off measurement), so that you can’t slip with a probe possibly 

causing a short. 

First check if the ‘low voltage’section of the circuit works. 

Don’t connect the high voltage RAW DC supply yet. 

1. Connect a DC supply of 15V (50mA) to +15VDC [+] and GROUND [-], but don’t 

apply power yet. 

2. Connect a multimeter (set to measure Volts) between G1 [+probe] and GROUND 

[-probe] (it helps to solder a small piece of wire to the G1 test-point). 

3. Apply power to the 15V supply and check the multimeter. It should read around 

10.4V. Also check the temperature of U4 (LT1085) with a finger. You might feel it 

warming up a bit, but it should not be very hot. 

4. Power down and disconnect the probes. 

5. Connect the multimeter (still set to measure Volts) between R8 [+probe] (the side 

away from the opamp; right below C7) and GROUND [-probe]. 


7.1V. 


8. Connect the multimeter (still set to measure Volts) between R1 [+probe] (either 

side of R1) and GROUND [-probe]. 


1.2V. This last measurement indicates that the opamp is working correctly. 


v1.0 27-12-02 page 22/27


The next step is essential. Failure to do so may cause components to exceed 

their maximum ratings. 

With a small screwdriver, turn R16 fully counter clockwise. This may take 10-20 

turns. At one point, when turning the adjustment screw, you’ll hear a slight clicking 

sound. The trimmer is now at its end-stop. Leave it at this position. 

Set a multimeter to measure resistance. Do not apply power. 

Measure the resistance between points A and B (the pins of R16). Use non-clamping 

probes (i.e. probes with fine/sharp points) for this measurement. The meter should 

read (about) 100 Ohms. The CCS is now set for minimum current (around 25mA). 

Now check if the high voltage section of the circuit works correctly. For this you need 

two multimeters (ideally three so you can measure RAW DC as well). 

If you have a variac (or a regulated B+ supply), I recommend using it to slowly raise 

the RAW DC when testing. 

If you’re using the mosfet shunt option, make sure you’ve mounted and soldered the 

jumper (solder side). If you’re using the tube/mosfet cascode shunt option, turn on the 

tube heater supply and allow the heater to fully heat-up. 

v1.0 27-12-02 page 23/27


1. Connect the first multimeter (set to measure mVolts) between I [+probe] and 

GROUND [-probe] (it helps to solder a small piece of wire to I). 

2. Connect the second multimeter (set to measure Volts) between V reg [+probe] and 

GROUND [-probe] (it helps to solder a small piece of wire to V reg ). 

3. Connect the 15VDC supply to +15VDC [+] and GROUND [-], but don’t apply 

power yet. 

4. Connect the RAW DC supply to RAW B+ [+] and GROUND [-], but don’t apply 

power yet. 

5. Apply power to the 15VDC supply. 

6. Apply power to the RAW DC supply (or if you’re using a variac raise slowly). 

7. If all is well, I (the first multimeter) should be at about 250mV (indicating 25mA 

shunt current). V reg (the second multimeter) should slowly rise to RAW DC or a 

lower value. It will take about 2 minutes for V reg to stabilize. 

8. If V reg rises to RAW DC and I decreases, then V reg is set too high. 

9. If V reg rises to a value below RAW DC and I remains stable (about 250mV), then 

V reg is set too low. 

10. Now -slowly- adjust R3 to set V reg to the correct value. Turning R3 clockwise 

increases V reg ; turning R3 counterclockwise decreases V reg . Because of the large 

RC-time of C2 and R15, it will take some time for V reg to stabilize after adjusting 

R3, so adjust R3 one turn at a time, and wait for V reg to settle. 

11. V reg should now be set at the correct value. Power down the RAW DC supply and 

check that V reg quickly drops. Re-apply power to the RAW DC supply and verify 

that V reg slowly rises to the correct value. 

12. If you have a scope, check the V reg rail. You should see clean DC. 

13. Power down both supplies. 

If the above tests have successfully been completed, the regulator works. All that 

needs to be done now, is to set the shunt current while powering the actual load. 

Do not adjust R3 anymore, only R16. 

1. Connect the two multimeters like before (I and V reg ). 

2. Connect the load to V reg [+] and GROUND [-]. 

v1.0 27-12-02 page 24/27


3. Apply power to the 15VDC supply and the RAW DC supply. 

4. Verify that V reg slowly rises. 

5. As V reg rises, I will drop. When I drops, turn R16 clockwise to increase I. Beware 

that V reg rises slowly, so allow time to stabilize before adjusting R16. 

6. When V reg reaches the value you set it to before, set I to the desired shunt current 

(I shunt ). 

The regulator is now setup for powering the load. Beware that for a different load, you 

will need to readjust V reg and I. 

v1.0 27-12-02 page 25/27


9 Parts list 

Reference Component Description Notes 

L1 1mH 0.29A PCB mount HF choke Panasonic ELC series 

L2 2.2mH 0.2A PCB mount HF choke Panasonic ELC series 

D1 1N4007 Diode 1000V 

D8 BZX55C15 15V Zener diode 

D3 BZX55C9V1 9.1V Zener diode 

T1 LND150N3 HV depletion mode MOSFET Can be replaced by BSS135 (change R4 to 330R) 

T2, T4 IRF830 HV MOSFET IRF830: 500V max 

T3, T5 2SK369-V JFET Can be replaced by 2SK170-V (Idss > 14mA) 

U2, U3 TL431 Programmable shunt regulator TO-92 

U4 LT1085CT Adjustable regulator TO-220 

U1 OPA655P Wideband, Unity Gain Stable, FET-Input Op Amp DO NOT SUBSTITUTE OTHER OP AMP 

C1, C2, C4 1uF 630V MKP capacitor 27.5mm lead pitch EPCOS, WIMA 27.5mm lead pitch 

C5 10uF 16V Electrolytic capacitor Sanyo OSCON SC 


C10 2.2uF 16V Electrolytic capacitor Sanyo OSCON SC 


C9 22UF 16V Electrolytic capacitor Sanyo OSCON SC 

C6,C11 100nF 50V Ceramic capacitor X7R 2.5mm lead pitch 

C7, C14 10nF 50V Ceramic capacitor X7R 2.5mm lead pitch 

C13 10pF Silvered mica 5.7mm lead pitch - mounted on component side 

R16 100R Trimmer 25 turn Bourns 3296W series 

R3 5K Trimmer 25 turn Bourns 3296W series 

R6 20R 0.5W resistor All 0.5W resistors have 7mm package 

R18, R19 150K 0.5W resistor 

R14 220R 0.5W resistor 


R10 1K6 0.5W resistor 


R4 10R 0.25W resistor All 0.25W resistors have 4mm package 

R5, R21 100R 0.25W resistor 


R15 470K 0.25W resistor 


R22 11K 0.25W resistor 

R17 4K7 0.25W resistor 



WE 637 Heat sink 25.4 * 34.9 * 12.7 

WE 647 Heat sink 25.4 * 41.9 * 25.4 

v1.0 27-12-02 page 26/27


10 Schematic 

v1.0 27-12-02 page 27/27

HV Shunt Regulator - Parts List 

Name Description Part No. Distrib QTY 

T1 Transfo 15V external supply, 15V, 0.334A TE70023-ND Digikey 1 

L1 Inductor, 1mH, 0.28A, pcb insert mount 434-01-102J Mouser 1 

L2 Inductor, 2.2mH, 0.18A 434-01-222J Mouser 1 

D1 1N4007, Diode Digikey 1 

D2 1N4744A, 15V, 1W Zener Diode, DO-41 1N4744A-TPCT-ND Digikey 1 

D3 1N4739A, 9.1V, 1W Zener Diode, DO-41 1N4739A-TPCT-ND Digikey 1 

T1 LND150N3, MOSFETs - Depletion N-Channel 500V 689-LND150N3-G Mouser 1 

T2,4 IRF830, MOSFET N-CH 500V 5A TO-220AB IRF830A-ND Digikey 2 

T3,5 2SK369-V, JFET 2SK369 ebay 2 

U1 OPA656, IC OPAMP WDBND VFB FETIN SOIC-8 595-OPA656U Mouser 1 

U2,3 TL431, IC SHUNT REG ADJ PREC 1% TO-92 ZTL431ACSCT-ND Digikey 2 

U4 LT1085CT, IC LDO REG ADJUSTABLE 3A TO-220 LT1085CT-ND Digikey 1 

C1,2,4 Cap. 1uF, 630V, MKP BC BC1850-ND Digikey 3 

C3 Cap. 33uF, 16V, OSCON 94SA Vishay 16F3759 Newark 1 

C5 Cap. 10uF, 16V, OSCON 94SL Vishay 16F3795 Newark 1 

C6,11 Cap. 100nF, 50V, Ceramic X7R, Kemet 399-4264-ND Digikey 2 

C7,14 Cap. 10nF, 50V, Ceramic X7R, EPCOS 495-1065-1-ND Digikey 2 

C8 Cap. 10uF, 25V, OSCON 94SC Vishay 16F3782 Newark 1 

C9,9A Cap. 22uF, 16V, OSCON 94SL Vishay 16F3795 Newark 2 

C10 Cap. 4.7uF, 10V, OSCON 94SC Vishay 16F3772 Newark 1 

C13 Cap. 10pF, Silver Mica Local 1 

R16 Pot. 100R, 25-Mutliturns, Top, Bourns 03F3875 Newark 1 

R3 Pot. 5K, 25-Mutliturns, Top, Bourns 3296W-502-ND Digikey 1 

R1 30.1R, resistor 1 % MF, 1/4W, Yageo 30.1XBK-ND Digikey 1 

R2,7 301K, resistor 1 % MF , 1/2W, Phoenix SFR16S PPC301KXCT-ND Digikey 2 

R4 10R, resistor 1 % MF, 1/4W, Yageo 10.0XBK-ND Digikey 1 

R5,21 100R, resistor 1 % MF, 1/4W, Yageo 100XBK-ND Digikey 2 

R6 20R, resistor 1 % MF, 1/4W, Yageo 20.0XBK-ND Digikey 1 

R8 200R, resistor 1 % MF, 1/4W, Yageo 200XBK-ND Digikey 1 

R9,13 20.0K, resistor 1 % MF, 1/4W, Yageo 20.0KXBK-ND Digikey 2 

R10 1.65K, resistor 1 % MF , 1/2W, Phoenix SFR16S PPC1.65KXCT-ND Digikey 1 

R11 121R, resistor 1 % MF, 1/4W, Yageo 121XBK-ND Digikey 1 

R12 10R, resistor 1 % MF , 1/2W, Phoenix SFR16S PPC10.0XCT-ND Digikey 1 

R14 221R, resistor 1 % MF , 1/2W, Phoenix SFR16S PPC221XCT-ND Digikey 1 

R15 475K, resistor 1 % MF, 1/4W, Yageo 475KXBK-ND Digikey 1 

R17 4.70K, resistor 1 % MF, 1/4W, Yageo 4.75KXBK-ND Digikey 1 

R18,19 150K, resistor 1 % MF , 1/2W, Phoenix SFR16S PPC150KXCT-ND Digikey 2 

R22 11.0K, resistor 1 % MF, 1/4W, Yageo 11.0KXBK-ND Digikey 1 

Heatsink 1 Heatsink H25.4 X L34.9 X W12.7, Black HS190-ND Digikey 1 

Heatsink 2 Heatsink H25.4 X L41.9 X W25.4, Black HS276-ND Digikey 1

HPHV Shunt regulator v1.1d Instruction Manual - BasAudio.Net

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