This circuit was found in a 1980s American documentation. The data circuit has a low speed, according to the components used. Transistors support modern equivalents.
This circuit is from old documentation. The operational amplifier is uncommon nowadays. The...
The circuit shown was found in a Japanese publication from the 1960s. Transistors can be...
This oscillator can generate signals from 100 kHz to more than 50 MHz depending on the crystal used...