Tweakers' Asylum

RE: Heathkit IG-18 mods 2008?

65.19.26.190

PhilH

In Reply to: RE: Heathkit IG-18 mods 2008? posted by ironbut on December 21, 2008 at 13:28:25

For the potentiometer, check Mouser stock # 31VW601 at Mouser.com

Mouser sells Zetex transistors that might work OK. Look at ZTX651 (npn) and ZTX751 (pnp). They also have a PNP Darlington if you need even more gain -- ZTX705

Hope this helps. I have a IG-5218 with the Walter Morrey "Super Oscillator" mods from Audio Amateur (Issue 4/75) but I think mine needs a little work too.......

Phil

Follow Ups:

another thought - PhilH 14:04:39 12/21/08 (2)
I once also considered just gutting IG-5218 (keeping freq & amplitude switching capabilities) and using the "Ultra-Low THD Oscillator" circuit from the data sheet for the LT1115.
- RE: another thought - ironbut 15:17:35 12/21/08 (1)
  Wow, thanks a million Phil. I'll have to check these other options out. I've got a little time on my hands so this is a good time to do this kinda stuff.
  - RE: another thought - PhilH 14:04:44 12/22/08 (0)
    You're welcome and good luck. I'd be interested in learning what you end up doing so if you have some successes, please post them if you can.
    
    thanks
    
    Phil

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