Op Amp Radio

Author	Views	Views Today	Rank	Comments
	394,471	4		80

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.

Related Circuits

Comments

Add A Comment

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?

The last 10 comments are currently shown. Show All Comments. Add A Comment

If you would like to leave a comment, you can do so using the form below. Comments can be things like suggestions, successes or failures, improvements, similar circuits, error reports, an answer to a previous commenter's question, or anything in between. However if you would like to ask a question it is suggested that you use the forum instead. The forum provides a more robust environment for discussion.

Important: If you post a technical question here, there is no guarantee it will be answered. All technical questions should be posted to the forum. The owner of this site generally does not answer questions in comments.

All comments are subject to approval before they are displayed here, so your comment will not appear immediately. This is done mainly to prevent spam and other abuse. If you wish to remain anonymous, simply enter "anonymous" for your name and/or email.

Name:
Email:
Subject:
Comments:
Anti Spam Code:	Please enter the exact text shown in the image above into the box below. Browser cookies must be enabled to comment on circuits.

Privacy Policy

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?