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Power Line Circuits
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Last Updated:
June 02, 2021 01:44 PM |
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| Circuits Designed by Dave Johnson, P.E. : |
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5v Line-Powered Isolated Supply - Often a circuit requires a 5v DC supply to power some logic circuits. The conventional method is to use an AC wall adapter. But, many systems, which bring AC power onto a circuit board, need a small AC to DC power supply right on the circuit board. The . . . Hobby Circuit designed by Dave Johnson P.E.-July, 2009
Appliance Unplugged Alarm - I received a call from an administrator at a large prison. He told me that he was having problems with inmates who keep unplugging refrigerators, vending machines and microwave ovens in a commons area. He wanted a battery-powered device, which could be mounted to the outside of the power cord of an appliance. . . . Hobby Circuit designed by David Johnson P.E.-April, 2010 |
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Miniature 5v Line Powered Isolated Supply - Often a circuit requires a 5v DC supply to power some logic circuits. The conventional method is to use an AC wall adapter. But, many systems, which bring AC power onto a circuit board, need a small AC to DC power supply right on the circuit board. The. . . Circuit by David Johnson P.E.-July, 2009
Modified Cheap Solar LED Path Light - Modification of a typical solar path light with a standard 1000ma-hour NiMH
AAA cell. I then replaced the small 4 cell solar panel with a larger 4 cell unit, which produced 150ma in the sun. Next, I simply changed the 470uH coil on the circuit board to a 22uH coil. The lower inductance increased the battery current to 40ma when the LED light was on, which translated to about 13ma LED current. The light was much brighter. . . Circuit by Dave Johnson P.E.-October, 2012
Tiny 5v Line Powered Isolated Supply - Often a circuit requires a 5v DC supply to power some logic circuits. The conventional method is to use an AC wall adapter. But, many systems, which bring AC power onto a circuit board, need a small AC to DC power supply right on the circuit board. The. . . Circuit by David A. Johnson P.E.-July, 2009
Unplugged Appliance Alarm - I received a call from an administrator at a large prison. He told me that he was having problems with inmates who keep unplugging refrigerators, vending machines and microwave ovens in a commons area. He wanted a battery-powered device, which could be mount. . . Circuit by David A. Johnson P.E.-April, 2010 |
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Links to electronic circuits, electronic schematics and designs for engineers, hobbyists, students & inventors:
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220 Volt Live Wire in Wall Scanner- This little circuit will help you to scanline of a 220V live wire inwall. FET gate is connected to a capacitive metal sensor ( which is usually a simple metal plate). When you holdsensor close towall, LED will indicatecurrent flow around where it detectswire. Works on 9VDC __ Designed by Peter Jakab 3½-Digit DVM IC Measures Power Facto- 04/28/94 EDN Design Ideas: Circuitry in Fig 1 allows ICL7106/7107] digital-voltmeter IC, IC4, to measure power factor to0.1% resolution and operate from a single 9Vdc supply. An important feature of circuit is that variations in load current, line voltage, Design by Devadoss John and KRS Sarma, Hindustan Cables Ltd, Hyderabad, India
5v Line-Powered Isolated Supply- Often a circuit requires a 5v DC supply to power some logic circuits. The conventional method is to use an AC wall adapter. But, many systems, which bring AC power onto a circuit board, need a small AC to DC power supply right on the circuit board. The . . . Hobby Circuit designed by Dave Johnson P.E.-July, 2009 |
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Appliance Unplugged Alarm- I received a call from an administrator at a large prison. He told me that he was having problems with inmates who keep unplugging refrigerators, vending machines and microwave ovens in a commons area. He wanted a battery-powered device, which could be mounted to the outside of the power cord of an appliance. . . . Hobby Circuit designed by David Johnson P.E.-April, 2010 Miniature 5v Line Powered Isolated Supply- Often a circuit requires a 5v DC supply to power some logic circuits. The conventional method is to use an AC wall adapter. But, many systems, which bring AC power onto a circuit board, need a small AC to DC power supply right on the circuit board. The. . . Circuit by David Johnson P.E.-July, 2009 |
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Modified Cheap Solar LED Path Light- Modification of a typical solar path light with a standard 1000ma-hour NiMH
AAA cell. I then replaced the small 4 cell solar panel with a larger 4 cell unit, which produced 150ma in the sun. Next, I simply changed the 470uH coil on the circuit board to a 22uH coil. The lower inductance increased the battery current to 40ma when the LED light was on, which translated to about 13ma LED current. The light was much brighter. . . Circuit by Dave Johnson P.E.-October, 2012 Tiny 5v Line Powered Isolated Supply- Often a circuit requires a 5v DC supply to power some logic circuits. The conventional method is to use an AC wall adapter. But, many systems, which bring AC power onto a circuit board, need a small AC to DC power supply right on the circuit board. The. . . Circuit by David A. Johnson P.E.-July, 2009
Unplugged Appliance Alarm- I received a call from an administrator at a large prison. He told me that he was having problems with inmates who keep unplugging refrigerators, vending machines and microwave ovens in a commons area. He wanted a battery-powered device, which could be mount. . . Circuit by David A. Johnson P.E.-April, 2010 |
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Power Line Circuits |
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