Above diagram is a very easy and efficient receiver for actuating garage doors, starter motors, alarms, warning systems and many some other possibilities. The SCR, which has a extremely low trigger current of 30 uA is typical — it demands an input electricity of just 30 uW to activate the relay. A high Q tuned antenna circuit assures rejection of spurious signals. A whip or wire antenna is adequate as much as 100 feet from a low power transistor transmitter. A momentary-off switch resets the circuit.
The circuit specifies a whip or wire antenna which just means a solid piece of wire 6-12 inches lengthy (15-30cm). The antenna coil is experimental, however you are able to begin with ten to 12 turns of #22 (0.7mm) magnet wire, and 5/16″ (8mm) coil diameter. Antenna wire is soldered at 1/2 turn of the coil and the gate of the BRY35 is soldered about halfway the coil. This circuit will transmit as much as 100-feet with the above specifications @ 30uA.
The relay coil is specify’s as much as 200 ohm but that’s only the one I had in stock. Any low-ohm relay, even at 9V or so, should work. And a remaining note, do not count on too much with this circuit. The “Simplest R/C Circuit” is just that; Easy!
The BRY35 is really an classic semiconductor made by Philips. A good alternative could be the EC103D1, also produced by Philips (see pin-out picture for this device). NTE Semiconductors gives an alternative of NTE5405, but I’ve not attempted it. I believe, a NTE5400 (30V) or NTE5401 (60V) will work just also. The NTE5405 is a bit overkill at 400V.
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Dear sir,
At what frequency is the R/C receiver supposed to work? And why does the antenna need to be connected at half a turn on the coil from the ground end?
Kind sir,
At what frequency is the R/C receiver supposed to work? And why does the antenna need to be connected at half a turn on the coil's ground end?
... and we need the transmitter circuit diagram too ... please .. can you provide this for us?
hi
pleas send for me circuit radio controller and how coding and decoding signal of radio controller?
I would like to find more info about R/c since I am intrested
its great...
thanks