Thank. Source Selected frequency acoustic remote control switch circuit using 74LS74
Other circuits
Infra Red Switch with 555 and 74LS74 Any “button” of any remote control may be used to work this universal switch. The button must be pressed for about one and a half seconds (determined by R3 and C2) before the relay will [...]
This circuit should only be used with the solenoid type chime doorbells, the electronic type that play tunes will not work here. This is the simple circuit design. The basic principle work is the hardest part for this circuit was the title. It is quite easy to miss the sound of a doorbell if [...]
The Light Actuated Relay Circuit be office circuit with the light. The prominent point of this circuit be meet the light has fast more using LDR the very. When the light leaves work suddenly. When meet the light makes Photo Transistor work bias current change it has made the transistor works to cause Relay work [...]
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