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 circuit was found in a 1960s documentation, providing a 2,000 gain amplified output. | Clique na...
Frequency in this oscillator is controlled by a crystal. Any 1 MHz to 15 MHz can be used. The JFET can...
This small source is suitable for low consumption equipment that uses batteries. The circuit is...