Newest circuit diagrams
PWM Motor Control
This is a circuit to control motor speed uses pulse width modulation (PWM). The PWM signal is generated by the ubiquitous 555 timer and output current amplified by a power transistor. Read more...
Latch Switch
In this circuit a non-locking push switch is used to activate a load. The load remains switched on until power is removed from the circuit. Read more...
Shed/Garage Alarm
This is a simple single-zone burglar alarm circuit. Its features include automatic Exit and Entry delays. It's designed to be used with the usual types of normally-closed input devices such as - magnetic-reed contacts - micro switches - foil tape - and PIRs. Read more...
Supply Voltage Indicator
A novel supply voltage monitor which uses a LED to show the status of a power supply. Read more...
Energy Leak Detector
High sensitivity, portable temperature comparator Detects draughts around doors, windows, etc. Read more...
Hijack Alarm No. 3
This circuit was designed primarily for the situation where a hijacker forces the driver from the vehicle. If a door is opened while the ignition is switched on - the circuit will trip. After a few minutes delay - when the thief is at a safe distance - the Siren will sound. Read more...
E-B-C Transistor Pin Identifier
Tests transistors and diodes for polarity. Simple circuitry - 9V Battery operation Read more...
