QSC RMX2450 schematic for a.a.p.l-s
"Eeyore" wrote in message
...
Phil Allison wrote:
"TimPerry"
what fires the 2n5064 in the crowbar circuit? looks like the 2 gates
are
tied together and go nowhere else. how does that make a diac?
** It doesn't - as a rule.
Just tried two GE brand C106D1s ( 400 volt, 4 amp sensitive gate
SCRs)
connected as shown in the QSC schem.
Functioned like a pair of soggy, 18 volt zeners wired back to back.
Hardly the best substitute for a low voltage diac !
Graham
it might be that purchasing got a really good deal on 5064's.
i wonder what happens when the NP cap goes bad. it fires every half cycle?
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