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131 articles written by Jim Keith

Author: Jim Keith

About: I grew up in Massachusetts. I cut my teeth on electrical cord and learned how not to splice such by age 7. Started building my first hobby circuits at age 11 using the venerable 1N34A diode & 2N107 transistor. In high school, I knew more than the teacher so I taught my physics class electronics--LOL. Still too dumb to get into MIT, I attended Wentworth Institute of Technology (where MIT dropouts also go) and then Moody Bible Institute. However, most of what I learned was not in school. I eat, drink and sleep circuits--repeatedly, have I awoken with a circuit solution. The electronics industry has provided good employment throughout my career and now retired, I continue with hobby stuff and a small ebay electronics business. The photo is that of Toby, my grandaughters' beagle.

Website: http://www.electroschematics.com/author/j-keith/

Series Commutated SCR SSS Solar Charge Control Schematic

Series Commutated SCR SSS Solar Charge Control

Jim Keith - 11/17/2014

A series commutated SCR makes a very unusual Solid State Switch in this solar charge regulator control. Advantages [...]
High Voltage Switching Regulator 24V

LM5008 High Voltage Switching Regulator

Jim Keith - 09/23/2014

What do you do when your maximum input voltage = 90V and /or linear regulator has unreasonable power [...]
SCR Based SSS Solar Charge Control Schematic 1

SCR Based SSS Solar Charge Control

Jim Keith - 09/03/2014

A force-commutated SCR makes a novel Solid State Switch in a solar charge regulator control. Prior art includes [...]
3A Solar Charge Control Schematic

A Primer on Solar Charge Controls

Jim Keith - 08/04/2014

A primer on solar charge controls A brief search on eBay turned up some 4700 listings for solar [...]
transmitter schematic

Holtek HT12E encoder in high-density ASK R-C applications

Jim Keith - 07/03/2014

The high-density ASK (amplitude shift keying) environment is one in which there are so many transmissions occurring at [...]
Low Voltage Battery Level Indicator Circuit 1

Low Voltage Battery Level Indicator

Jim Keith - 06/11/2014

Up to now, this battery level indicator design was limited to 12 & 24V applications. In past circuits, [...]
Classic Full-Wave Bridge

Enhanced Voltage Doubler Power Supplies

Jim Keith - 05/11/2014

While most readers are knowledgeable about voltage doublers, here is a discussion about how to use them in [...]
6V SSS Solar Charge Control Schematic

6A, 6V SSS Based Solar Charge Control

Jim Keith - 05/04/2014

This is a Solid State Switch upgrade to the 6A, 6V Relay Based Solar Charge Regulator. Solid state [...]
6V Relay Based Solar Charge Control Schematic

6A, 6V Relay Based Solar Charge Control

Jim Keith - 04/27/2014

This 6V solar charge regulator meets most small-scale 6V application requirements. With a current rating of 6A, it [...]
Photomod Schematic

The Photomod Optical Coupler

Jim Keith - 04/20/2014

The photomod opto isolator was the isolation device of choice (only choice) a generation ago. Since it predated [...]