supersedes log 1. Inventory?
So I got the 4-channels 200MHz DDS, the 4×300MHz scope, as well as a 2×200MHz DSO, and a new supply of AF240S.
I can now choose between 3 classes of Ge transistors :
- 1600 medium-gain but slow PNP G106T, AF137, AF138 (hFE >60, Ft < 50MHz)
- 700 faster but lower gain PNP AF178, AF200 (hFE>20, Ft > 100MHz).
- 10000 very fast, low voltage, low gain PNP AF240S
The slow transistors can be used for I/O ports. For example keyboard input, LED drivers, GPIO, serial I/O... Probably using saturated logic as well, whereas the AF240 will use ECL.
No idea about how to implement some memory, though. I don't want to suffer the magnetic/core memory hell... I will certainly cheat and use modern CMOS ASRAM :-)