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

Parts

Part	Total Qty.	Description	Substitutions
C1	1	Tuning Capacitor
C2	1	0.1uf Disc Capacitor
R1	1	10 Meg 1/4 W Resistor
D1	1	1N34 Germanium Diode
U1	1	741 Or Similar Op Amp
L1	1	"Loopstick" Antenna
MISC	1	IC Socket, Crystal Earphone, Wire, Antenna

Notes

The antenna can be a piece of wire or a telescoping antenna. 18 inches is a good length for in the city.

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.

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.

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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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?