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paulsherwin · 29th Nov 2019, 5:52 pm

I don't understand why your transistor substitutions are causing excess current. They might go pop as they're low current devices, but if they survive they should work.

Is there anything unusual about the MPSA42? I haven't looked it up (I'm on a phone.)

29th Nov 2019, 5:52 pm	#3
paulsherwin Moderator Join Date: Jun 2003 Location: Oxford, UK Posts: 27,947	Re: 2N4401/2N4403 substitutes I don't understand why your transistor substitutions are causing excess current. They might go pop as they're low current devices, but if they survive they should work. Is there anything unusual about the MPSA42? I haven't looked it up (I'm on a phone.)