4
\$\begingroup\$

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?

\$\endgroup\$
9
  • \$\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
  • 1
    \$\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
6
\$\begingroup\$

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...

Enjoy!

\$\endgroup\$
3
  • \$\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

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.