Found in a1967 Ferranti documentation, this circuit uses an operational amplifier from that time. The circuit uses a LDR as a sensor and has a null setting.
Other series operational amplifiers, such as MC34072, MC34074, MC35071, MC35072, MC35074 d MC33071...
This TTL circuit was found in a 1978 technical documentation. The power must be supplied with 5 V....
We found this circuit in documentation from the 90s. The circuit uses components that are still...