This circuit from Popular Electronics powers a small speaker. The transistor can be of general use and the capacitors can be altered to change the sound generated.
This circuit was found in a documentation from the 50's. The transistor is made of germanium and...
Here we show a configuration in which we have a control voltage applied from a voltage divider, which...
March 2017 - The new Texas Dual ISO762xxL digital isolators are available at Mouser Electronics...