Audio Controlled Relay Circuit

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transistors - audio controlled relay circuit - Electrical ...

https://electronics.stackexchange.com/questions/4742/audio-controlled-relay-circuit

First, Vin from the audio minus .7 volts (diode drop) divided by R needs to be less than the maximum current your audio device can supply. This is worst case …

Electronic – audio controlled relay circuit – iTecTec

https://itectec.com/electrical/electronic-audio-controlled-relay-circuit/

First, Vin from the audio minus .7 volts(diode drop) divided by R needs to be less than the maximum current your audio device can supply. This is worst case where the capacitor is charged to 0V. Averaging Capacitance Now, your averaging resistance times your capacitance needs to equal 1 over the frequencyyou want to have as a maximum.

Sound-Controlled Relay – Electronic Circuit Diagram

https://freecircuitdiagram.com/4454-sound-controlled-relay/

Just replace the switch with this relay and now you have a sound-controlled device. This circuit uses a 741 operational amplifier to amplify the signal form microphone with the gain about 100 times. This circuit must use a dynamic circuit, …

Switching Controlled by an Audio Signal | Radio Design Labs

https://www.rdlnet.com/blog/tips/switching-controlled-by-an-audio-signal/

RDL ST-ACR Series Audio Controlled Relays are used in any application where an audio signal must be used to create either a relay closure or Open-Collector output to control another piece of equipment or a circuit. Common applications include: Juke Box overrides Background Music AN-2024 Silence or “Dead Air” Sensor in broadcast environments

Audio Volume Relay Attenuator with IR Control

http://circuit-zone.com/?electronic_project=92

Compact and simple circuit with just 6 tiny relays implement a 64-step logarithmic stereo attenuator. The 64 steps of 1.0dB together span a 63dB audio attenuation range. By avoiding any active electronics, a very clean and open …

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