Electronics > Projects, Designs, and Technical Stuff
Inexpensive Dual NPN Transistor in Metal Can Package?
Wolfgang:
Right, the ICL8038 is getting rare. If you are already on the trip to nostalgia, you could "emulate" the 8038 by a triangle generator and a diode/transistor waveshaping circuit to get a reasonable sinewave. :)
schmitt trigger:
I do find merit in a hobbyst attempting to build a vintage circuit, at least while most parts are somehow available.
It is a challenge, like properly restoring a classic car, and careful substitutions will require to be made here and there. It also requires a lot of elbow grease.
Godspeed to them!
Fortunately, the OP does not have PWBs, in which he would be forced to use a certain footprint for a component. Even then, one could still manufacture a small adapter board for those instances.
If it were me, the 8038 would be my biggest concern, as it is indeed the heart of this circuit.
JPortici:
--- Quote from: Zero999 on January 25, 2019, 10:43:12 pm ---Matching VBE is more important than gain. Shot the collector to the base, test using a multimeter's diode test function and use two transistors with as similar readings as possible. Glue them together so they're in good thermal contact.
--- End quote ---
i like this transistor matching technique :)
http://www.dragonflyalley.com/synth/images/TransistorMatching/ianFritz-transmat0011_144.pdf
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