Model Train Throttle Control


Posted on Mar 13, 2013

What makes this control unique is its momentum feature, which adds a degree of realism. The circuit will opera


Model Train Throttle Control
Click here to download the full size of the above Circuit.

te well for trains that draw up to 1 A at 15 V. None of the components are critical. In the start mode, current source Ql charges capacitor CI. The charge current and start-up time are adjusted by resistor R2. In the stop mode, current-sink Q2 discharges capacitor CI. The discharge current and stop time are set by resistor R4. In the coast mode, op amp Ul draws very little current from CI, so the speed will remain nearly constant for some time, and then gradually decrease. Transistors Q3 and Q4 form a Darlington emitter-follower to amplify the output of Ul. Diode D7 reduces the output by about 0.8 V. Another diode could be added in series to decrease the output to 0 in the stop mode.




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

PC DATA LOGGER
Windshield washer fluid watcher
Simple Ir Transmitter
9 Volt Portable Mixer Circuit
electronic circuit amplifier
Electret Condenser Microphone (ECM) Preamplifier
Binary Phase Shift Keying (BPSK) modulation using CD4016 with Simulated output waveform
Ion detector circuit diagram electronic project
Hybrid Headphone Amplifier
Conveyor control Ladder



Top