This heating element control with up to 3 kW was obtained from an old American documentation. SCRs must be load-compliant, and transistors can be current equivalents.
This VHF receiver with three transistors and loudspeaker listening was found in European...
This sensor was published in Radio Electronics magazine in April 1962. The two-transistor circuit...
This circuit consists of a monostable multivibrator using the LM3900 transconductance operational...