Simple Switch off delay circuit using 2N4871
This circuit prevents surges. From the opening is switched off or power failure. The damage to electrical appliances.
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July 26, 2017
Surge protection circuit for power supplies
The surge protection circuit important! Sometimes, our electrical appliances may damage easily by little high voltage surges. We can protect this problem.
June 26, 2017
Cheap air compressor time delay circuit
This is a cheap air compressor time delay circuit. We especially design Air conditioning or refrigerators
December 21, 2015
The tweeter speaker protection circuit
This is The small tweeter speaker protection circuit It can be packed into any speaker cabinet, and does not require a power supply as well. [...]
February 24, 2014