Thread: Quad FM3 tuner.
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Old 21st Apr 2013, 6:38 pm   #3
Radio Wrangler
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Location: Fife, Scotland, UK.
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Default Re: Quad FM3 tuner.

That looks a very tidy job. I especially like the yellow LEDs to mimic the colour temperature of the glowing tuning bulbs.

TR4 TR5 D1 look a bit odd. It seems that without a signal they reduce the long tail bias current, so the collector loads go high and the emitter followers make both bulbs bright.

Less light for more signal does seem counter intuitive.

David
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