Recent content by FuzzyTheBear

A word of caution Unless you do have access to very high power resistors it will end up in smoke. Think about it .. 13.8 volts 40 amps that's 552 watts ! That's the power of small electric heater baseboard. You need a 1000W resistor or so to make such a test. Using lower power rating...

Impedance / bandpass Many devices offer low output impedance compared to the load.This is simply to allow for ex a mic to be able to be split to the FOH console and the monitor console without degradation in performance. We often see 200 ohm rated outputs on preamps / digital signal...

at least really close The schematic for the 422A is truly really close to what i got under my eyes. chip nummers vary but i need to check the change between a 7130 and a 7131 but i believe it's close enough to allow me to get the job done. At least layout is truly really similar. It's...

Sam's Well i see this listed .. TRC-421 (21-1536)..................273 Wonder how different the 421 and 421A are Anyone's got the 421 then ? ps got the full lc7131 Sanyo data sheet. I checked it's operation earlier on , the chip seems to react correctly , i see the keying ...

On the LC7131 that was the first part i had suspected and since i had two new ones in stock , just changed it for the heck of it no go .. ill come back to the thread every now and then see if anyone found anything about this mystery radio :) Thanks guys :)

Chassis the chassis type is a p-200979 tells us nothing on google and yahoo etc .. And no Sams does not have anything on it . Before i came here i had already exhausted the list of obvious places , including the Radio Shack website and sent them a message asking for it only to be told they...

Anyone know where to get the schematic for that radio ? TRC-421A is not on the Radio Shack website Would be much appreciated. Fuzzy

Hello Trying to find a schematic/service manual for a Realistic TRC-421A which seems to be a bit hard to get. The RS web site does NOT have a schematic for it and my searches have not turned out anything up to now. If anyone knows where one is hiding or have a copy i would really...