Newest circuit diagrams
Capacitive Sensor
Special design for shop-windows animation. Useful for many types of touch controls Read more...
Antenna Tuning Unit
A simple passive (no power required) circuit to match an antenna to a radio receiver. This will be a useful addition to the short wave listener, but in addition a medium wave coil is almost used to tune the medium wave band. Read more...
Small Variable power Supply
Features: 1.3-12.2 V, 1 A, over-current protection. This is a simple but reliable device based one of the oldest integrated voltage regulators of them all - the LM723. Read more...
Switch De-Bouncer
This circuit will remove the transient spikes and contact bounces from a non-latching push button switch. Read more...
Latch Switch 2
This circuit uses a Silcon Controlled Rectifier (SCR) as a latch switch. Once enabled it can only be turned off by pressing S2 or power is removed from the circuit. Read more...
Speaker Mic Circuit
This circuit takes an ordinary loudspeaker and allows it to be used in reverse, as a microphone. Read more...
Basic UPS
This circuit is a simple form of the commercial UPS, the circuit provides a constant regulated 5 Volt output and an unregulated 12 Volt supply. In the event of electrical supply line failure the battery takes over, with no spikes on the regulated supply. Read more...
12 Volt 20 Amp Power Supply
A 12 Volt high current 20 Amp power supply. The output voltage is variable from 12.2 Volt to 14.4V so can be set for any device requiring voltage and current in that range. This PSU uses an LM723 as the regulator, 4 parallel connected outboard pass transistors and has current limiting above 25 amps. Read more...
