I have a circuit which switches on by sending current to the base of one of its transistors. I'm trying to make receiver which can receive signals from a AM transmitter and send current to base of transistor so that circuit can switch on the circuit. I know how can I make AM transmitter. Given that I cannot use any receiver module/chip etc, please suggest a simple circuit design which can serve the purpose.

EDIT: I need a receiver with minimum range of 500-700meters. I have made this AM transmitter. As stated above I'm not trying to send audio signals, the circuit stays on as longs as current is passing through base of transistor. I want the circuit to stay on as long as transmitter is sending signals to receiver. What modifications I have to make in transmitter circuit for that.


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  • \$\begingroup\$ As you can see from the answers, your question it is very broad. Please specify the transmission EIRP and distance bertween Rx and Tx to get more pricise answer \$\endgroup\$ – GR Tech Apr 18 '14 at 21:55
  • \$\begingroup\$ The question hasn't got any better by just adding the range without transmitter details as above, frequency, how it's modulated and generally what you're trying to do. \$\endgroup\$ – PeterJ Apr 19 '14 at 9:39
  • \$\begingroup\$ Added a link of my transmitter design. \$\endgroup\$ – Amol Borkar Apr 19 '14 at 10:12
  • \$\begingroup\$ If you are not planning to transmit an audio signal, do you mean to say you just want a circuit to detect the presence of the unmodulated carrier from your transmitter? \$\endgroup\$ – Anthony X Mar 11 '18 at 20:14

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