1-Ttube reflex receiver (T1555E)

This one-tube circuit is equivalent to the previous one. We find it in a 1924 book by Gernsback, Power is made by batteries.

Non-Inverting Amplifier (CB20172E)
This amplifier circuit for instrumentation was found in the manual of the used integrated circuit...
TTL Beep-Beep (CB14033E)
We found this circuit in a 1986 Elettronica Pratica magazine, but the components used are common. As...
High current buffer (CB7280E)
Suggested by Popular Electronics, it is a digital amplifier, for pulses with frequencies up to a...