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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
    Commented Apr 18, 2014 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
    Commented Apr 19, 2014 at 9:39
  • \$\begingroup\$ Added a link of my transmitter design. \$\endgroup\$
    – Amol Borkar
    Commented Apr 19, 2014 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
    Commented Mar 11, 2018 at 20:14

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