Design and theory of operation
20169223D 3-17
TB1-1: Power pos (10-15VDC)
TB1-2: Power RTN
TB1-3: TC (Take Command) signal
TB1-4: IC (In Command) signal (Enable)
TB1-5: FU (Follow-up) signal 0-1mA
When pushing the PTTC button, the flip-flop circuit IC5 is switched
via the IC4, thus switching on transistor Q1 to energize the relay RL-
1. The relay contact A switches TC to LO (GND) at the same time, the
"IN CMD" lamp LP will be switched on via the jumper switch S3 in
pos. 2. The dimmer control varies the voltage output of the regulator.
IC2 and LED's D3 and D4 are for scale illumination.
The relay RL1 will be deenergized by another push on the TC button,
as this will make the flip-flop change one more time.
The trim potentiometer RV1 provides offset adjustment.
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