This circuit allows you to read resistors up to 20 M ohms, converting it into voltage. The circuit is from the 90s. The operational ones used admit modern equivalents.
This amplifier can work with voltages between 12 and 22 V. This means that we can use it in the...
This circuit was used to regulate the speed of small DC motors of cassette recorders. However, if the...
This is a factory circuit from an 80's manual. The circuit can be implemented with modern...