How To Find a Transistor Replacement

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Sometimes you need to replace an old transistor with a modern equivalent. Let's figure out exactly what transistor we need for the clock circuit in the Amstrad CPC 464 while learning some interesting things about transistors along the way.

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Chapters:
00:00 Intro
01:11 Transistors
04:14 Clock circuit
06:54 Simple circuit
09:09 Faster!
14:16 Real signal
16:50 Testing in board
19:30 Amstrad circuit
20:47 Conclusion

Links:
Online simulator
The Art of Electronics 2nd Edition

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