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In Reply to: RE: Mybe this is the reason: posted by Triode_Kingdom on December 29, 2018 at 22:23:19:
Above is the protection circuit from the Texas Instruments 337 data sheet.
And this is Gillespie's EFB, as currently implemented in my Dynaco SCA-35.
TI says, "When CL is larger than 20µF (which it currently is, in my SCA-35) D1 protects..." So it seems a diode across V In to V Out would be in order.
But since the EFB's 4.7µF cap is under TI's "C2 larger than 10µF", could that diode be omitted? I'm not trying to nit-pick the cost of a diode, but space is at a premium where the 337 is mounted.
As to your question of why DAK gave up on the EFB so quickly, I've wondered that too. I just checked Mouser, and a TI LM337 is $0.85
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Follow Ups
- Would you check me on this, TK? - 1973shovel 06:55:49 12/30/18 (2)
- Yep - Triode_Kingdom 07:32:46 12/30/18 (1)
- Thanks! (nt) - 1973shovel 08:46:32 12/30/18 (0)
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