This interface shield circuit is from the 1983 Intersil Databook. The components used are uncommon today. ADCs are low-cost digital converters. The power source voltage must be 5 V.
This circuit can generate signals up to 100 kHz. Found in documentation from the 1980s, it makes...
Some old record players use variable reluctance phono pickups, requiring a special amplifier...
This circuit is from a Radio Electronics from July 1965. The circuit uses components from the time...