This resistance meter was found in an English documentation from 1989. The operational amplifier admits an equivalent and the transistor can be a BC558 or BC559.
We found this shield circuit in a 1991 technical documentation. The phototransistor can be...
This circuit is from a 1992 Electronics Handbook. The circuit generates a special tone effect for...
With this circuit we can demonstrate the operation of a Schmitt trigger using TTL logic. The...