[ARC5] [BoatAnchors] TCS: Better Speaker "Ear Popping" Cure.

[don davis]

OK, got it now.  Yes, in theory all of these "should" work but clippers are more difficult than they look.  Most of these are made to work empirically.  What Arden refers to is reverse recovery time (trr) which sets a limit for the time to suck all of the energy out of the junction so it is ready to switch again.  As an example 1n5811 (high speed switching device) has trr = 30nsec.  May or may not be relevant since this is rated and measured at high power, but yours' is at low level signal.  I looked at the 1n4004 and it doesn't spec this.  For space use we used to spec the amount of energy that had to be dumped as well as trr.  When we modeled Zeners in SPICE we would always put a 10 Meg resistor across to get them to  "work right" or they would frequently fail to initialize for initial values.  Maybe try this in actual circuit?

Either config should work (series back to back or parallel with blocking diodes) but with the zeners in series with a high impedance into a high impedance circuit I can see why it might not work.  

73 de don ad6pb

-----Original Message-----
From: BoatAnchors [mailto:boatanchors-bounces at theporch.com] On Behalf Of Arden Allen via BoatAnchors
Sent: Thursday, February 11, 2016 6:42 PM
To: David Stinson <arc5 at ix.netcom.com>; 'Old Tube Radios (new)' <boatanchors at minime.theporch.com>
Cc: Arc5 at mailman.qth.net
Subject: Re: [BoatAnchors] TCS: Better Speaker "Ear Popping" Cure.

> ......That's correct, Don.  Arden's idea is a good one-
connecting the Zeners cathode-to-cathode *should* work just like the circuit with the steering power diodes.  But it doesn't.  Not a bit.  Speaker still pops with keying.  I have no idea why what I drew works and what Arden suggests doesn't.
Makes no sense to me.  I just stuck with what worked.

CORRECTION:  That effect says to me the zener diodes you're using have a much longer forward conduction delay.  After all they were NOT designed to operate in the forward mode.  I wonder if a spec sheet could tell us.  I'll try to find out, not that it's necessary for Dave's functioning clipper.

Back to the Demo destruction derby...

Arden Allen
KB6NAX

He who is cruel to animals becomes
hard also in his dealings with men.
We can judge the heart of a man by
his treatment of animals.
—Immanuel Kant

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