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Caution
•
Continuous sine and square wave signals can be damaging to speaker and amplifier components
at high volume levels or for extended periods of time.
•
Due to variances in frequency response of amplifier circuits and speaker systems, the audible
signal level may appear to change with FREQUENCY adjustment.
VCO Input
This input allows the Tenma Audio Generator tremendous capabilities as it enables the output frequency to
be controlled by an external source. Applying DC input voltage from 1.2V~5.0V provides linear frequency
adjustment from 20Hz~20KHz, enabling the following possibilities:
•
Connection to a programmable power supply, creating a programmable sweep function
generator.
•
Connection to a user designed interface, creating a computer controlled audio generator.
•
Connection of a remote potentiometer for easy frequency adjustment from a remote location.
This input is designed to provide frequency control from 20Hz~20KHz, with 1.2V~5.0V input voltage. This
input will accept voltages up to 14.0VDC without damage, however the frequency adjustment will not be
linear above 20KHz.
When a 1/4" connector is inserted into the VCO INPUT, the front panel FREQUENCY control is inactive.
Note: The control voltage polarity is TIP (+); SLEEVE (–).
DC LOOP output is provided to enable multiple 12VDC interface devices to be daisy-chained to a common
DC power supply. It is also possible to use this output as a voltage supply to the VCO input. By
connecting suitable components as shown in the following diagram, a remote mounted potentiometer may
be used, without the need for a separate VCO power source.
Take note that the TIP polarity on the DC LOOP output is (–), while the TIP polarity on the VCO input is
(+).
Tenma Test Equipment
Distributed by:
MCM, an InOne company
650 Congress Park Drive
Centerville, OH 45459
www.mcminone.com
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