Using L144 operational, this circuit applies to other equivalent operational. The circuit is from a documentation two years 90. The power supply must be symmetrical.
The circuit shown in the figure can be used to detect the operation of infrared sources whose...
Found in a 90s Hands On Electronics, this small preamp finds applications like microphones and other...
This circuit was found in a 90s Popular Electronics. The frequency is determined by R3 and C1 that...