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June 27th 04, 05:00 PM
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Further investigation of Eton(Grundig)S-350 drift problem.
Folks, I dismantled this silver puppy. And here is what we found! The
RF board dated 2004.4.15 . TWO PVC tuning capacitors. PVC1 has 4 built-in trimmers,PVC2 got none . PVC2 appears to contain more plates. IC1 is TA7358AP. Circuitry is indeed purely LC based analogue- there is not a single crystal in the oscillator/mixer area . So, if the variable capacitors are using pvc as an insulator I can imagine that would partially explain such wild frequency drift due to temperature changes How stable is TA7358AP? |
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