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.

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

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
anonymous
Op Amp Radio
Thursday, January 03, 2008 2:13:12 AM
what is the value of inductor?
pram
Op Amp Radio
Tuesday, November 20, 2007 9:44:50 AM
give details about the crystal air phones
anonymous
Op Amp Radio
Monday, November 19, 2007 5:21:08 AM
kwame,try 10-20 turns on 1inch pill-bottle
Anurag
Op Amp Radio
Tuesday, November 13, 2007 2:57:56 PM
can anybody send me the exact ckt diag of a digital quality fm radio having surround sound output that is generally used in mobile fones

(Editor's notes: Good luck with that...)

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