Remote control unit switches a lamp for 15 sec on the mains 110 V or 230 V schematic & demo

On Ebay or Aliexpress you can buy these remote control units (transmitter-receiver) on (say) the 455 MC consumer band for a few dollars/euro’s. They are interesting. You can use them in a remote controlled doorbell circuit, etc. Here I show a so called “vox” circuit, made with 2 transistors that activate (first) a small relay, that activates a powerful relay, that is made to switch something (a lamp) “on” for 15 seconds on the mains supply, be it 110 V AC or 230 V AC. Much more info in the video.

Important to tell (and extensively explained in the video): the transformer that I used is more or less tiny and can (only) give out 12 Volt at 192 mA maximum. In reality: a lower constant current. That is not so much current, it means a substantial voltage drop when the circuit is activated, anyway, it works properly. Reason is that the relays get their proper voltage (12 Volt/15 Volt) in the very first moment, and after that, the voltage drops, but due to the magnetic effect the relay contacts keep sticking as long as the timing capacitor (470 uF) has enough charge. The power relay (12 Volt/170 DC Ohms/230 V AC) normally needs approx. 70-100 mA to keep the contacts constantly closed.

There are more than 1000 Video’s on my YT channel. I only do analog electronics: audio amplifiers, analog measuring devices, radio circuits, many Shortwave radios, many oscillators HF and audio, other audio & shortwave circuits. Also many (test) generators for all kinds of waveforms, both in the audio range and HF. Also simple “switch” circuits like the Schmitt triggers acting on different input voltages, 555 circuits and circuits of basic electronics issues like “Ohms law”, resistance properties, capacitance properties, the capacitors testing process, electronic “matching” in audio circuits and audio amplifiers, audio pre amplifiers, microphone amplifiers, etc. In all cases you find the schematic inserted in the video.

When you have questions about (certain analog) electronic circuits and how to make them: go to my Channel trailer (Radiofun232 on You Tube) and go to the “looking glass”. Type there the keywords that you want/need like: “power supply”, audio amplifier, capacitor tester, oscillator, radio, shortwave, shortwave radio, or any keyword you like to find the essential info & schematics on my YT channel.

You can contact me via email when you have questions about my published circuits. I always ask for a picture of what you have made + a problem description; I ask to communicate.

My You Tube channel trailer is here: https://youtu.be/xbgQ8T3oqh4 When you search, search always “NEWEST FIRST” to get the right overview. You can also search via the “looking glass” on my Channel trailer via keywords like ”audio”, “radio”, “amplifier”, “filter”, “Shortwave”, “transistor”, “FET”, “oscillator”, “generator”, “switch”, “schmitt trigger” etc; so the electronic subject you are interested in. My books about electronics & analog radio technology are available via the website of "LULU”, search for author “Ko Tilman” there.
I keep all my YT videos constant actual, so the original video’s with the most recent information are always on YouTube. Search there, and avoid my circuits that are republished, re-arranged, re-edited on other websites, giving not probable re-wiring, etc. Some persons try to find gold via my circuits. I take distance from all these fake claims. I cannot help that these things happen. Upload 15 October 2021.
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