This circuit uses an amplifier from National Semiconductor, uncommon nowadays. The numbers in parentheses are for the second channel. The circuit is suitable for old tape recorders.
This oscillator with the CA3130 was obtained from an English publication from 1977. The circuit does...
We found this circuit in a technical documentation for the National Semiconductor LM3909. The...
This commercial transistor radio was manufactured by RCA in the 1960s. The circuit has only 4...