This is a Japanese commercial radio from the 60s. The superheterodyne circuit of 7 transistors for medium waves has 200mW of output when powered by 4 common batteries.
Using an old integrated circuit, this low power amplifier, on the order of a few watts, includes tone...
This wired intercom circuit was found in an English publication from the 80's. The integrated...
It is an ideal assembly to be implemented as work by students of digital electronics courses, as...