Re: A Simple Programmer for TESLA "MH74S-" bipolar PROMs
Thanks circuitryboy, appreciated.
I can confirm that I do have some 74C906 and also some 74HCT125, if these would be OK as alternatives to the LS125s.
I was looking around for the transistors and while all the ones in your sketch are available I was wondering if the two NPN Darlington pairs which switch VCC / VPP and the four data bit 'sinks' could all be substituted with a single type of medium power Darlington, such as the BD679? (T0126, 80V, 4A, Hfe 750).
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