This circuit is designed to provide delayed relay switching action at power on. The delay is a function of the time constant produced by the combination of R1 and C1. At power on, C1 charges slowly via R1 and the coil of the relay. When the voltage across C1 exceeds both the base-emitter voltage of [...]
A friend of me wants the circuit at can turn ON Fan 12V at use in an automobile. By fix the period of time about 10 second. He sets conditions that must use electronic part economize and seek easy with. I then choose transistors and relay be control electric fan equipment follow the circuit in [...]
This is an alarm clock I built. It was very effective during the sort time I used it, because I programmed it to play a very annoying tune through a speaker. I actualy started to wake up before the alarm went of, so other people int he house didn’t wake up from the anoying pitches [...]
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