We found this circuit in the May 1972 issue of Radio Electronics magazine. Its purpose is to teach logic using integrated circuits of the TTL family. The 5 V power supply is included.
This circuit was found in a Texas Instruments optoelectronics documentation. The gain depends on...
The circuit presented was found in a Japanese magazine in 1973. The circuit uses transistors of...
This simple step of low power audio is from a 1975 documentation. The transistor can be a BC548, and...