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install Echo Board in Cobra 29LTD
Posted: Friday 27th Apr 2007, 12:36
by gundoctor
I have an echo board out of an old Galaxy 99. I want to put it in a Cobra 29 LTD Classic. The problem is it needs 8 volts for the power.
Does anyone know where I can connect to 8 volts?
Posted: Saturday 28th Apr 2007, 1:12
by kc8mob
get a 7808 and chasis mount it by the power plug. Simpel IC voltage regulator
Posted: Saturday 28th Apr 2007, 2:09
by gundoctor
Thanks. I was thinking about tapping the emitter side of TR23, but I'd rather it just have it's own with the 7808. Thanks for the input!
Re: Install Echo Board in Cobra 29 LTD classic.
Posted: Saturday 28th Apr 2007, 8:05
by Rick
You can safely pick up 8 volts at the emitter of TR28, if you need the transistor to handle more current change it to a 2SD926 with a 1 watt Zener.
Rick.
Posted: Saturday 28th Apr 2007, 19:58
by nomadradio
That echo board shouldn't pull much more than 15 or 20 mA. Won't overload TR28.
73
Posted: Sunday 29th Apr 2007, 5:40
by gundoctor
Thanks, I'lll just pull it from the emitter of TR28 then.