This low noise microphone preamplifier circuit was found in American documentation from the 90s. The circuit requires special care with the layout. The power can be between 9 and 18 V.
With the use of precision resistors and capacitors, this circuit with programmable unijunction transistor...
The 4066 is better than the 401 B because the 401 B has a lower internal resistance when the...
This alarm circuit was found in a 2004 documentation. The circuit searches for open NC sensors....