VDO Marine - Howard Instruments

Special Application Devices
Signal Amplifiers, Multiplier & Dividers
P/n 411.110
Signal interface
The VDO Signal Amplifier/Divider is a general purpose module designed to convert the signal
from square wave to sine wave and vice versa.
It can divide as well as multiply the frequency in small steps up to three times plus or minus.
Ideal for calibrating electronic boat speedo or tachometers.
12/24V
P/n 410.020
Tachourmeter active signal filter
The VDO active filter can reduce the effect of electrical noise mixed with signal.
This is in situation when the electrical interference is excessive and the speedo
or tacho have a pointer fluctuation (erratic reading).
Inputs: Red Battery +12/24V, Orange Ignition + 12/24V, Green Signal Input, Blue Signal Output
Note: Connector IN & OUT made to suit the VDO, Vision & International Tachourmeter
12/24V
P/n 411.096
Tachometer inductive sender, signal amplifier/Frequency Divider
The VDO Signal Amplifier/Divider is a general purpose module designed to work with most
speedometer and tachometer signals. This box will amplify a low voltage signal to a 10V peak to
peak square wave. This can be useful when a signal is too low to drive a speedometer, tacho,
cruise control or any other such device. The signal may also be divided in frequency by a factor
of 1, 2, 4, 8 or 16 to allow easier integration to another instrument.
12/24V
P/n 411.101
Over-Rev switch with two independent channels
A microprocessor controlled electronic switch module that can be programmed for a number of
different functions. With two separate signal inputs switching two separate 5A relays contact the
module can be a number of functions’ combination. RPM, Speed Shaft rotation monitoring.
12/24V
70