This digital signal attenuator was found in a 90s Electronic Design. The circuit operates at frequencies that are determined by the characteristics of the attenuator circuit.
This circuit was found in the 1977 National Semiconductor FET Databook. The FET can be the BF245...
This circuit can work with power voltages from 6 to 35 V, being suggested by the Motorola Linear...
This circuit was obtained from a 90s Radio Electronics. The value of R1 determines the scale...