Need a Radio Schematic. - Page 2

dangus · 27th November 2007, 02:25 AM

Old OEM car radios are virtually free, and should offer excellent RF performance since they had to operate under constantly varying reception conditions. Adding a 12V supply to one should make a great table radio.

Some also supported AM stereo; a friend had that in his '80s K-car, and it didn't sound bad at all.

I_Forgot · 27th November 2007, 02:46 AM

The ZN414 chip was a real amazing one when it came out (late 70's, IIRC). It was a TRF type AM receiver in a 3 lead can that looked like a transistor. It was commonly found in behind-the-ear miniature radios that were powered by a hearing aid battery and tuned via a slug-tuned coil with a fixed capacitor. You could make SW radios out of them by tweaking the tuned circuit a little. Back then there was something to listen to on SW besides big-haired preachers begging for money so they can stay on the air and beg for more money.

That reminds me of another great chip. The Votrax speech synthesizer chip. It was the first (that I know of) phoneme based speech synthesizer that could be made to say anything, unlike the TI chips that were formant based and could only say prerecorded stuff. I built up a Votrax chip board and connected it to the printer port on my commodore 64 and had it talking up a storm.

I_F

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27th November 2007, 02:25 AM	#11
dangus diyAudio Member Join Date: May 2004 Location: Vancouver Island	Old OEM car radios are virtually free, and should offer excellent RF performance since they had to operate under constantly varying reception conditions. Adding a 12V supply to one should make a great table radio. Some also supported AM stereo; a friend had that in his '80s K-car, and it didn't sound bad at all.

27th November 2007, 02:46 AM	#12
I_Forgot diyAudio Member Join Date: Jan 2005 Location: Phoenix, Az.	The ZN414 chip was a real amazing one when it came out (late 70's, IIRC). It was a TRF type AM receiver in a 3 lead can that looked like a transistor. It was commonly found in behind-the-ear miniature radios that were powered by a hearing aid battery and tuned via a slug-tuned coil with a fixed capacitor. You could make SW radios out of them by tweaking the tuned circuit a little. Back then there was something to listen to on SW besides big-haired preachers begging for money so they can stay on the air and beg for more money. That reminds me of another great chip. The Votrax speech synthesizer chip. It was the first (that I know of) phoneme based speech synthesizer that could be made to say anything, unlike the TI chips that were formant based and could only say prerecorded stuff. I built up a Votrax chip board and connected it to the printer port on my commodore 64 and had it talking up a storm. I_F

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