Archive for the Category


Extension Phone Line Switcher by SCR 2N5061

Monday, July 14th, 2008


Having multiple extension telephones at home is very convenient. You can make or receive phone calls practically anywhere in the house. This circuit disables other telephones connected to the phone line whenever a telephone (either the master or any extension phone) is in use. The circuit is inexpensive and is guaranteed to keep the phone [...]

Phone Line Controller by PIC16F84

Monday, July 7th, 2008


It might be “yet another” «device» controller that operates over phone-line, but this one works for sure The task was to build a device that connects to the phone line and has a relay as an output switch. It should also sense if the connected «consumer» is turned-on or off and report to the [...]

DC motor runs off of calculator solar cell in dim light

Wednesday, July 2nd, 2008


How do we achive 10nA operation? By using diodes in place of pull up resistors, and by isolating the DC load from the trigger circuit via junction drops and the 10nF capacitor. If there is too much power comming from the solar cell then the motor might run too often or even continuously. You can [...]