[sdiy] Barron ringmod

[Neil Johnson]

Hi,

Matthew Skala wrote:
> Indeed, but at the cost of adding four regular diodes.

Diodes are cheap, both zener and regular.
The function of the diode ring is to ensure symmetry - the tolerance
of the zener voltage can be very high, typically 5%.  The smaller
signal diodes contribute a small forward voltage to that of the
zeners, but any differences in those diode forward voltages will be
much less than any differences due to zener tolerances in a twin-zener
circuit.

David G Dixon wrote:
> Plus, if the diodes are well matched (which they usually are) then
> the resulting waveform will be symmetrical about zero because
> only one zener is defining both polarities.

Yes.

Neil
--
http://www.njohnson.co.uk