Op Amp Radio


Author Views Views Today Rank Comments
73,118 27 50
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.

Related Circuits

3 Watt FM Transmitter, 8 Watt Audio Amp, 22 Watt Audio Amplifier, 50 Watt Amplifier, Crystal Radio, FM Transmitter, Guitar Fuzz Effect, FET Audio Mixer, Microphone Mixer, 8 Note Tune Player, Op Amp Radio, Mono To Stereo Synthesizer, Electronic Stethoscope, Tone Control, Transistor Organ, Stereo Tube Amplifier, Digital Volume Control, Sound Level Meter, Aircraft Radio Communications Receiver

Comments

SHIBU B
Op Amp Radio
Monday, July 14, 2008 7:04:49 AM
It is really wonderful to hear that we can make fm radio using IC 741
anonymous
Op Amp Radio
Saturday, May 31, 2008 2:18:48 PM
by applying 324 opamp, can we build an extra output stage and use speaker?
incromatical
Op Amp Radio
Sunday, May 18, 2008 2:50:48 PM
what is the purpose of the 1n34 diode? can i use any diode or do i have to use that specific one? let me know...
anonymous
Op Amp Radio
Thursday, May 15, 2008 5:59:35 PM
can i change the 1N34 Germanium Diode what is her similar Diode if possile help me
Paul jayanta
Op Amp Radio
Wednesday, April 30, 2008 12:30:36 PM
If by using 741 ic we can make a fm radio that will be great.
ganesh
Op Amp Radio
Thursday, March 27, 2008 8:25:28 AM
what is mean by loopstick?.can i made this inductor as hane work?
Ado_PO
Op Amp Radio
Monday, March 24, 2008 9:20:39 PM
Tried it, worked well for a wirenest, OP drove a pair of old morse training headphones paralel conected so there is a 2kohm load. I didn`t find a 10Mohm rezistor so I used a serial chain of trimers. For the LC I used the coil that`s described and a tuning capacitor that goes up to 380pF. I have the negative pole grounded and the antenna is a bit of a wire that goes across the room near the ceiling.Selectivity is really a bother as I heard morse from the shortwave and even commercial FM stations. But that must be because of the local transmition station placed a few km away.
acegard
Op Amp Radio
Monday, February 18, 2008 5:35:54 PM
can i use a LM324? if so could anyone give me a schematic??
anonymous
Op Amp Radio
Friday, January 18, 2008 5:00:02 PM
does this circuit really work. if so, how well?
JASON
Op Amp Radio
Monday, January 14, 2008 12:54:23 PM
HELLO,TO PICK UP SHORT WAVE CAN YOU EXPLANE FILM CAN PLUS IT SIZE.THANK YOU FROM JASON
The last 10 comments are currently shown. Show All Comments.

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

Back To Circuits Page | Mail Me | Search