Comment

Comment by PinetreeJoe on January 24, 2012 at 5:42pm

Beetlejuice, smojo is right about cutting out the reciever part ( I would cut it at the audio out ) then wire your jack there. at the volume , or cut the power somewhere past the resistor that is on the amp side. cut the power, ground and audio gain . I

  I am posting a link to a page that shows pics and diagrams of radios like yours, check out the whole page and some of it will make sense. I hope this helps.

http://www.electronics-tutorials.com/receivers/am-radio-receivers.htm

Comment by 3 String Blues on January 24, 2012 at 10:30am

thanks smojo...that makes sense...i need to figure out how to get rid of the Radio" stage' and just bypass and add a jack to the amplifier stage..it is not important to keep the radio for me as It always seems to bleed thru a bit ...i'd rather get rid of it all together.

here is what i am working on today and for some reason It gives problems when I try to tap in at the volume...but if I by pass the volume knob it works????
why is that so???
I need advice!
i am a butcher and want to be a surgon...what am i doing wrong???

Comment by smojo on January 24, 2012 at 6:13am

Oh and i just bought a job lot of cool radios on Ebay. Pretty cheap but only one of them works to any degree so I need to learn how to fix them first too. Got some work ahead of me!

 

Comment by smojo on January 24, 2012 at 6:09am

You're doing alright so far. I'm still learning too. As far as I can figure, a radio is made up of several "stages". The first stage tunes into the radio signal. That needs demodulating (changing the frequency down to something we can hear) and then the signal needs amplifying so we can shove it through a speaker. All we are interested in is the last stage. The radio signal hits the volume control before going into the amplifier stage so that's where we need to connect to. I guess for best results we should disconnect the wire that's coming from the previous stage so we don't get any radio breaking through. I need to experiment yet to be sure of this. But what I do realise is that if you turn on the radio and only hear a crackle and no radio station, it may just be the tuning stages that are not working but the amplifier is so don't assume it won't work for us. Try tapping onto the volume pot with your own guitar or signal generator signal.

Comment by 3 String Blues on January 24, 2012 at 1:34am

thanks guys for all the leads on learning and books...i really would love to pinpoint just the parts that are needed on these old radios and remove them and make my own mini amps or just tap right directly into them ( I am the twinkle towes strummer...I just touch wires andramdomly waste time).....I have a closet full of broken radios that i know must still work somehow??? I will study...seems like alot to learn...but I will take it little buy little

Comment by smojo on January 23, 2012 at 10:08pm

oops - forgot to add the link, here it is

 

http://101science.com/Radio.htm

Comment by PinetreeJoe on January 23, 2012 at 3:21pm

Beetlejuice, My books were  written by John E Lackey.I used them when I was learning to fix a bunch of old stuff that I couldn't get parts for so had to learn to substitute . They are well written, and very cheap on the internet. There are lots of them in hardback for less than $5.00.

try these.

 

www.abebooks.com/9780030603129/Fundamentals-Electricity...

www.abebooks.com/Solid-State-Electronics-Devices-Circuits-John/...

Comment by smojo on January 23, 2012 at 7:36am

Juice - here's an online electronics course worth looking at. Remember Rome wasn't built in a day. Don't get fazed by the amount of information. Just take one bite at a time and if you don't understand something try asking here for clarification. I'm not a total expert even though I've worked in telecoms all my life and have a good basic knowledge, I don't know much about radios but can probably answer most basic questions. Learning is fun if it's a subject you're interested in.

Comment by Corbie on January 23, 2012 at 12:19am

That's a nice one with the grille cloth and all. Nice grab.

Comment by Slowpaw Steve T on January 22, 2012 at 10:52pm

This group is really cookin'!

Managed to get this one working as a guitar amp after many hours of fiddling, though a little quiet, radio volume doesn't affect it, i connected the earth to the chassis ad touched around the antenna feed and adjacent printed circuit board. Happily i found a loose wire and resoldered one or two  joints and as a radio is working bettter than before!! (-:

 

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