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Sound activated relay - CircuitLib
https://circuitlib.com/index.php/projects/product/71-sound-activated-relay/category_pathway-18#:~:text=Sound%20Activated%20Relay%20circuit%20%28see%20electronic%20schematic%29%20To,IC1%20is%20used%20as%20a%20precision%20half-wave%20rectifier.
Sound activated relay - CircuitLib
https://circuitlib.com/index.php/projects/product/71-sound-activated-relay/category_pathway-18
The Sound Activated Relay can be used for turning on or off the lights in your house, for starting a voice recorder, for opening doors, activating sirens or other …
VOICE-ACTIVATED RELAY Model VAR1
https://www.bogen.com/sites/default/files/2021-01/var1_manual.pdf
The VAR1 Voice-Activated Relay is a DPDT relay device that is activated when an audio signal is detected at the microphone pre-amp or at 70V, 25V, or 600-ohm line level inputs. It has a number of useful applications, such as muting a sound system in response to a microphone or telephone page, activation of accessory (secu-
Audio Frequency Activated Relay Board ... - Quasar Electronics
https://quasarelectronics.co.uk/Category/kits-modules-audio-frequency-activated-relay-boards
Audio Frequency Activated Relay Board Kits Audio Frequency Activated Boards from our Electronic Kits & Modules range for industrial, professional, educational and hobby applications. You can use the Product Filters below to narrow the selection.
Sound Activated Switch - ElectroSchematics.com
https://www.electroschematics.com/sound-activated-switch-2/
So now you have a crude sound activated timer device. What you can do next is to add a relay driver at the output of your setup to wakeup external electrical loads like warning lamps or alarms when there is a loud sound. The trigger input of the relay driver circuitry must be connected to the D13 pin of Seeeduino Nano.
Sound-Activated Lamp (Relay/Switch) – Electronic Circuit ...
https://freecircuitdiagram.com/4617-sound-activated-lamp-relayswitch/
A certain level, the signal coming from microphone, after amplification by Q1, will trigger the SCR and light lamp I1. If we change the lamp with a relay, then we can get a sound-activated relay/switch, which can be used to control more powerful / high wattage high voltage lamps. If we use a relay, place a 1N4007 diode in parallel with the relay coil to prevent the back-emf from …
Cebek I-75 | Audio Frequency Activated Relay Module - 2-15 ...
https://quasarelectronics.co.uk/Item/cebek-i-75-audio-frequency-activated-relay-module-2-15khz
This audio frequency switched relay board will activate the onboard relay when the module detects the user-set input frequency from 2 KHz -15 KHz. The trigger frequency can be adjusted from 2 KHz -15 KHz using the onboard trimmer. The input voltage range is 100mV to 3V peak to peak. The circuit is based around an LM567C tone decoder IC.
Audio Activated Delay Switch Using Transistors - DIY …
https://circuits-diy.com/audio-activated-delay-switch-using-transistors-diy-project/
4,432 views. Audio activated delay switch is a circuit that can activate a relay switch for a specific time period. For example, when we are listening to an FM radio station there’s a sudden increase in volume when any advertisement or song plays. But with the help of this circuit that sudden increment of volume can be muted for 15 seconds and if the volume is still high …
3 Sound activated switch and Detector Circuit with PCB ...
https://www.eleccircuit.com/sound-activated-switch-circuit/
We use R6 to adjust the frequency of the oscillator circuit internal IC1. In this case, sets the frequency at 18Khz. Input frequency using be in the range 1/10 – 1/15 of the frequencies in above. In the frequency between 1.8kHz to 1.2kHz. The output of the circuit will change state each time to get an input signal comes. The output signal at pin 8 goes to the base of Q1 to …
Sound Operated / Sound Activated Electronic Circuits
http://www.discovercircuits.com/S/sou-operate.htm
Audio Activated Switch- This circuit will activate a transistor switch when it detects at least 50mv peak to peak of an audio signal. it could be used to turn on a relay, routing the signal to were it is needed.. . . Circuit by Dave Johnson P.E.-July, 2006. Detector/Switch for Audio Signal- For some audio systems it is desirable to have an automatic switch circuit turn on other devices, such as …
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