This circuit was found in a documentation of the 80s, having didactic purpose. For R1 values between 10k to 1M can be used. Transistors are general purpose types.
We found this circuit in a 1974 integrated circuit manual. Operational amplifiers can be of...
This circuit converts the voltage from 0 to 5 V set in R10 into a digital output that corresponds to the...
In the figure we present a circuit of a signal conditioner for microphone using the integrated circuit...