The power supply for this 1972 circuit must be symmetrical and the BC549 transistors. Care with the layout is important to avoid capturing tinnitus.
This CMOS circuit with the 4011 can be used in an infrared remote control. The circuit can be...
This power supply is protected from shorts in the load. The BD135 must be mounted on a heatsink...
With the values of the components of this circuit, tone recognition can be done in the range of...