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Circuits designed by David Johnson, P.E.
Last Updated on: Monday, July 11, 2016 01:59 PM

Master Category List - Dave's Circuits

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Power Control Circuits

Battery Polarity Reversal protects Circuit  -  This simple circuit can protect a sensitive electronic circuit from an accidental connection of a battery with a reversed polarity.  The N-channel FET connects the electronic device to the battery only when the polarity is correct.  The circuit shown was . . . [Circuit by David A. Johnson P.E.,  03/09/02]

 

Bi-Directional Charge Coupled Powers MOSFET Relay  -  The circuit uses an inexpensive C-MOS inverter package and a few small capacitors to drive two power MOS transistors from a 12v to 15v supply. Since the coupling capacitor values used to drive the FETs are small, the leakage current from the power line . . . [Hobby Circuit designed by Dave Johnson P.E.,  06/03/00]

Characteristics of CMOS Logic Inverter Amplifiers  -  This chart shows some of the measured characteristics of three different unbuffered CMOS logic gates, used as voltage Amplifiers . . . [Hobby Circuit designed by David Johnson P.E.,  02/11/02]

 

Protects from Battery Polarity Reversal  -  This simple circuit can protect a sensitive electronic circuit from an accidental connection of a battery with a reversed polarity.  The N-channel FET connects the electronic device to the battery only when the polarity is correct.  The circuit shown was . . . [Hobby Circuit designed by David Johnson P.E.,  03/09/02]

 

Solid State Relay Requires Only 50ua Drive Current  -  This circuit demands a control current that is 100 times smaller than that needed by a typical optically isolated solid state relays. It is ideal for battery-powered systems. Using a combination of a high current TRIAC and a very sensitive low current SCR . . . [Circuit by David A. Johnson P.E.,  06/03/00]


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The circuits on this site are designed by David A Johnson - unless otherwise noted.  David A. Johnson & Associates.  All Rights reserved. 
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