Johnny's homebuilt 8080 CPU corner (and other stuff, maybe)
Simple comparison between some different transistors, with and without a Baker Clamp (1N4148).
Note that the signal has gone through two transistors, so the actual delay per transistor is only half of what is shown.
Input signal is 1MHz, base resistor is 8K2 and collector resistor is 1K. As usual, the input diode is BAT42.
The goal here is to find a transistor with the smallest propagation delay.
Switching speed (high frequency) isn't that important. Propagation delay, however, is.
At the bottom you will find my new favourite transistor: KSP10
Yellow trace = Probe 1 Green trace = Probe 2
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Note: The ring is chartered for projects that include a home-built CPU. It can emulate a commercial part, that′s OK.
But actually using that commercial CPU doesn′t rate. Likewise, the project must have been at least partially built: pure paper designs don′t rate either.
It can be built using any technology you like, from relays to FPGAs.