Op Amp Radio


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Here is a simple radio that is easy to build and inexpensive. In fact, you probobly have all the parts you need in your junk box. You'll be suprised at the great reception with this little set.

Schematic

This is the schematic of the Op Amp Radio

Parts

Part
Total Qty.
Description
Substitutions
C11Tuning Capacitor
C210.1uf Disc Capacitor
R1110 Meg 1/4 W Resistor
D111N34 Germanium Diode
U11741 Or Similar Op Amp
L11"Loopstick" Antenna
MISC1IC Socket, Crystal Earphone, Wire, Antenna

Notes

  1. The antenna can be a piece of wire or a telescoping antenna. 18 inches is a good length for in the city.
  2. The tuning capacitor is a regular broadcast band tuning capacitor. I got mine from a junked AM radio. I got the loopstick antenna from that same radio.
  3. You can change L1 and C1 to recieve different bands (eg. Shortwave). To recieve shortwave, try this: Make L1 30 turns of 30 guage wire wound on a film can and make C1 a 10-365pf capacitor.
  4. Combine this circuit and the 8 Watt Audio Amp for a really neat radio.

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Comments

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anonymous
Op Amp Radio
Thursday, October 17, 2013 3:30:11 PM
I built a similar radio many years ago, using a mosfet opamp from RS, a TL 7611 I think. Feedback resistor was 100M ohm! So powerful on 1.5v, it didn't need external antenna!
advisor
Op Amp Radio working
Monday, October 01, 2012 10:52:00 AM
TO ALL VISITORS this schematic may not work. This is a similar op amp radio try it http://www.youtube.com/watch?v=3Zzmi_Kno4w&feature=fvwrel
SJN
Op Amp Radio
Friday, August 10, 2012 1:20:00 AM
cn any1 plz tell the specificatn's of the loopstk antenna used in the circuit...n y is an crystal ear ph used here..???
divyesh
Op Amp Radio
Thursday, July 14, 2011 1:13:44 PM
how it works....how it tune different frequencies...if i want 98.3Fm....how i can choose?....what about coil...& its value..?..can we use speaker instead ear phone...???
Stone
Op Amp Radio
Thursday, June 02, 2011 3:53:19 AM
It is best to use an LM386 OP AMP for this circuit to work but this circuit is very delicate. You get best reception at night. The 365 variable capacitor is very Important. I also used a 220 uH inductor.
rajesh
Op Amp Radio
Saturday, February 19, 2011 4:15:08 AM
bull shit this dosn't work whats the value of the goddam coil in that shit ckt of yours. if you dont send me the value right away i assure you will get a nice spanking from me.

(Editor's notes: Approved because this comment is awesome.)

jon
Op Amp Radio
Thursday, November 25, 2010 4:21:14 AM
Just built this set with great results. To decouple and increase the 'Q' just wrap a few turns of the aerial wire around the coil. Used an R.F choke instead of a coil for S.W listening. In reply to KDB5IH, ebay is my usual source for variables.
KD5BIH
Op Amp Radio- components
Thursday, November 11, 2010 11:03:06 PM
Hi! I've heen a ham since 1997. But, I have been in electronics almost 50 years (back in the tube days)! 10-365pf variable caps are getting really harder to find.. Any suggestions?? 73 KD5BIH
anonymous
Op Amp Radio
Friday, September 17, 2010 1:10:39 AM
i ve tried this ckt but failed to get the output..can anythin be used to modify d ckt n get a better output? also give some information abuot how to tune the ckt.
anonymous
Op Amp Radio
Wednesday, April 14, 2010 1:39:53 AM
ve tried this ckt but failed to get the output..der is sum sort of disturbance obtained in d end..can anythin be used to modify d ckt n get a better result?
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