Telephone Line Tester (CB21266E)

We found this circuit in a Radio Electronics from the 90s. The circuit is for conventional analog lines. All components are common nowadays.

| Clique na imagem para ampliar |

ATtiny1617 8-bit AVR Microcontrollers
August 2017 - Microchip's new ATtiny1617 8-bit AVR microcontrollers running at 20 MHz and 16 kB...
Active Bandpass Filter (CB6723E)
Found in a 1970 American publication, this circuit uses transistors of the time. These transistors...
APS1 Series of Optical Couplers
May 2017 - Panasonic's new APS1 series of optical couplers with 3 750 V insulation and up to 50...