View Single Post
Old 11th Oct 2019, 11:47 am   #11
SiriusHardware
Dekatron
 
Join Date: Aug 2011
Location: Newcastle, Tyne and Wear, UK.
Posts: 11,485
Default 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).
SiriusHardware is offline