I'm currently trying to make a simple 3 channels RF remote control circuit but without any ICs or micro-controller. I'm Googling but it seems to not populate (useful results). Does anyone have ideas?

  • \$\begingroup\$ Do transistors count as ICs? \$\endgroup\$
    – The Photon
    Dec 14 '12 at 17:22
  • \$\begingroup\$ The line for when you count certain components as ICs is a bit hazy. Not including such seems like an exercise in futility, It can be done reasonably with just OP-amps, but are they ICs? \$\endgroup\$
    – Kortuk
    Dec 14 '12 at 17:23
  • \$\begingroup\$ What sort of information do you want to transmit on the three channels? \$\endgroup\$
    – Dave Tweed
    Dec 14 '12 at 17:24
  • \$\begingroup\$ @ThePhoton: No, ICs I mean the thing like blackbox :D, I want to build an curruit from R, L, C, Trans, Wire, and any things we can easy make ourself \$\endgroup\$ Dec 14 '12 at 17:28
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    \$\begingroup\$ @BìnhNguyên Not related to your question but on how to use this site: Always wait for at least 24 hours or a number of answers before accepting one. You will not be encouraging people to give more answers (some new answers may be better). As a guide, try to settle out first all pending inquiries in the comments before accepting an answer. \$\endgroup\$
    – shimofuri
    Dec 14 '12 at 18:10

Here's a couple of transmitter circuits from this page and a few receivers. To be historically accurate, the receiver would drive a relay with three tuned reeds to activate three channels, according to the frequencies modulating the transmitter...


  • \$\begingroup\$ +1 You gave the OP a perfectly valid answer given the rather laughable design constraints, and he accepted the answer! This probably says more about human nature than electrical engineering, but it is still worth the +1. \$\endgroup\$
    – user3624
    Dec 14 '12 at 18:48
  • \$\begingroup\$ To be honest I was hoping someone would chip in with slightly newer references! (@Binh : feel free to un-accept the answer!) Though as it happens, it's not so silly an idea; triode valve circuits adapt quite well to JFets (and tetrode to JFET cascodes), and these have a quite amazing simplicity about them. (though transmitters nowadays really OUGHT to be crystal controlled...) Replacing the tuned reeds with opamp-based bandpass filters might be quite a reasonable concession to modernity... \$\endgroup\$ Dec 14 '12 at 20:19
  • \$\begingroup\$ @BrianDrummond: Thanks, but if possible, you can edit your answer :D Again: Sorry for my bad english :-( \$\endgroup\$ Dec 15 '12 at 14:55

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