How To Find a Transistor Replacement

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.

Support Noel's Retro Lab on Patreon:   / noelsretrolab  
You can also support Noel's Retro Lab on YouTube by joining this channel:
   / @noelsretrolab  

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 https://tinyurl.com/y6vfkjbw
The Art of Electronics 2nd Edition https://www.pearl-hifi.com/06_Lit_Arc...

Music tracks:
Funky Stars by McKlain https://mcklain.bandcamp.com/track/fu...
Battro OST by McKlain https://mcklain.bandcamp.com/track/ba...
More awesome music by McKlain: https://www.mcklain.com

🛠 Tools I use ➤ https://noelsretrolab.com/tools.html

Connect with Noel's Retro Lab:
Discord ➤   / discord  
Facebook ➤   / noelsretrolab  
Twitter ➤   / noelsretrolab  
Instagram ➤   / noelsretrolab  
Mailing list ➤ https://noelsretrolab.com