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I want circuit diagram of mosfet based preamplifier for fm radio dxing

Posted by Anonymous on

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6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

SOURCE: sharp wf 940 portable cassette / radio player

inside radio there is relay near power supply. change it and then radio will work. or clean it.

Posted on Mar 20, 2008

SOURCE: circuit diagram for alinco vhf base dr112t/e

respected sir,
you may find some idea here

http://www.eserviceinfo.com/

AK
from Bangaluru

Posted on Aug 27, 2008

  • 212 Answers

SOURCE: Clock is running but fm-am radio is not playing.

you need to change the circut board...

Posted on Jul 23, 2009

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Am fm power to high keyup 60 watts ssb works fine mosfet 2030


If SSB works. then the AM - Regulator Transistor is bad.

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Look for open resistors near by, if the 2SC1969 shorted it has taken out one or two parts, also check for open foils on the printed circuit, beyond this a circuit diagram is needed.

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How to conect to the radio


It will depend on the radio design as to exactly what components to identify as landmarks.

In general, you want to locate the preamplifier stage, and this can even vary by type of circuit. Sometimes you can tap the circuit at the volume control, other times you have to locate the point after the detctor stage which is the stage with the typically glass diodes. Often a single detector diode for AM and either 2 or 4 detector diodes for FM. You can try at this point of the detector. If you touch the solder track with a metal screwdriver and hear a buzz- it helps if you are working near a flourescent light.

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My sony icf 7600 AM/FM/SW/radio can not catch any channel.when i turn it on,its speaker give narmal on sound ,LED also works,prequency can b fixed in it ,but can not receive or catch any channel.where is...


Sony radios of this era had notorious capacitor problems.... also several other brands were affected. These capacitors were underrated and the technology to make them was not at it's best back then. The cure is to replace the capacitors on the board with new electrolytics. About 28 of them need to be replaced but the big problem is to find someone to do this. the original capacitors are surface mount and must be removed and new radial lead caps put in their place, some are rather tough to get at and the new ones have to be placed carefully. My SONY ICF-SW7600 now works as new and maybe even better!
I have done this myself as I have skills working with surface mount capacitors. I offer my services to those who cannot find service for their radios. Please email me for details, I am not into making bucks on this, I just want to see these radios kept working and bringing enjoyment to their owners.
Good DXing Rod KB8DNS (also copied and paste)

Mar 18, 2009 | Sony ICF-SW7600 AM/FM/SW Radio

1 Answer

My sony icf 7600 have speaker on sound when i turn on my radio,but it can not catch any AM or FM channels.where is the problem, and is it can be solved.no one know about it in my country Pakistan?


Sony radios of this era had notorious capacitor problems.... also several other brands were affected. These capacitors were underrated and the technology to make them was not at it's best back then. The cure is to replace the capacitors on the board with new electrolytics. About 28 of them need to be replaced but the big problem is to find someone to do this. the original capacitors are surface mount and must be removed and new radial lead caps put in their place, some are rather tough to get at and the new ones have to be placed carefully. My SONY ICF-SW7600 now works as new and maybe even better!
I have done this myself as I have skills working with surface mount capacitors. I offer my services to those who cannot find service for their radios. Please email me for details, I am not into making bucks on this, I just want to see these radios kept working and bringing enjoyment to their owners.
Good DXing Rod KB8DNS (copied and paste)

Mar 18, 2009 | Sony ICF-SW7600 AM/FM/SW Radio

1 Answer

Galaxy 99 v


Likely the radio has a blown detector diode on the board as FM uses a special demodulation detection circuit called a quadrature detector or a discriminator detector the SSB circuit uses a product detector so the only other thing used in detection is the Am detector Diode. That is the first place to look if it is not bad it will be somewhere in that circuit.

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Sharp wf 940 portable cassette / radio player


inside radio there is relay near power supply. change it and then radio will work. or clean it.

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