This high impedance circuit was found in 1967 documentation by Ferranti. The original operational amplifier is from that time. The circuit can be implemented with modern equivalents.
We found this circuit in a technical documentation from the 70s. It can be implemented with more...
This power oscillator uses an LM380 amplifier. We found it in old English documentation. The C3...
This circuit was obtained from a 1990s documentation. The transistor admits equivalent and other...