Found in Texas Instruments documentation from the 90's, this circuit can be used as a shield due its symmetrical power is 5 V. The circuit has offset adjustment and a pass band of 200 kHz.
This is a VU-meter bargraph with up to 7 LEDs according the Power supply voltage. Adjusts are made by...
This circuit was suggested by General Electric in 1970 documentation. It makes use of a photo-SCR...
This circuit was obtained from a 90s Elektor Electronics f. The output current of each sector is 1...