Newest circuit diagrams
Audio Perimeter Monitor
This circuit is intended for audio surveillance of an unattended area, examples being a back garden or open space. It can be used to listen for wildlife or just as an extra pair of ears. Read more...
SCR Based Burglar Alarm
This is a simple SCR based burglar alarm circuit. Its features include automatic Exit and Entry delays - together with a timed Bell cut-off and Reset. 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...
32 Watt Amplifier
A 32 Watt per channel stereo power amplifier made using the TDA2050V monolithic integrated circuit. Read more...
Power Fail Alert
In this circuit an electricity supply (domestic or industrial) is continually monitored. Should the supply be interrupted then an alarm will sound for the duration of the interruption. It has battery backup and overcharge protection. Read more...
Room Noise Detector
One LED monitors three levels: 50, 70 & 85 dB Useful to detect too noisy environments Read more...
6 Input Mixer
A simple mixer with 3 line inputs and 3 mic inputs using commonly available parts. Read more...
Decimal to BCD Convetor
This circuit will provide an output in Binary Coded Decimal from any of the input switches. The input switches may be expanded to 16 switches, providing a Hexadecimal to BCD conversion. Read more...
LM317 Voltage Regulator
The voltage regulator is an LM317T, and should accept up to about 14 volts without problems. It can handle up to 1 amp. Read more...
