Page 7 Charge Pump Electronic Circuits, Schematics, or Diagrams

Charge Pump Circuits Page 7
Charge Pumps: #-C D-N O-Z
Last Updated on: Wednesday, June 02, 2021 04:34 AM

Circuits Designed by Dave Johnson, P.E. :

Touch Switch Exciter - If you have hundreds of touch switches that need an excitation signal, then this circuit is what you need. Its 20KHz 20v peak to peak output signal can supply up to 3 watts of touch switch excitation power . . . [Hobby Circuit designed by David Johnson P.E., 02/11/02]
Ultra Pure 125kHz Sine Wave Signal Source - For some RFID systems operating at 125KHz, a very low distortion signal source reference is needed. The circuit shown on this page produces a 10-volt peak-to-peak signal into a 50-ohm load, with a distortion of only 0. 01% . . . [Circuit by David A. Johnson P.E., 02/11/02]
Very Low Power Astable Multivibrator - This classic circuit draws only 200 nanoamps from a 1. 5v supply . . . [Circuit by Dave Johnson P.E., 06/10/00]
Very Low Power Gated Crystal Oscillator - The circuit gates the output of a continuously operating 32KHz crystal oscillator to the input of a C-MOS buffer when clock pulses are needed. The technique gets around the problem of a slow starting crystal oscillator by keeping the oscillator going and switching on a transistor power stage only as needed . . . [Circuit by David Johnson P.E., 06/03/00]
Voltage Boost to Series Regulator provided by Capacitor - This circuit adds some capacitors and diodes to a traditional transformer type series regulator circuit to extend the normal operating range. It can insure regulation during low line voltage conditions or it can squeeze a few more watts out of a plug-in-the-wall power adapter power supply . . . [Hobby Circuit designed by David Johnson P.E., 01/01/98]
Wide Band Zero Cross Detector - This circuit was designed to convert a low amplitude 40KHz signal into a clean square wave signal. It will work with inputs as small as 5mv peak-to-peak or as large as 3 volts peak to peak. The input frequency can range from a few kilohertz to about 150 . . . [Circuit by Dave Johnson P.E., 02/18/06]
Zero-Cross Detector-Wide Band - This circuit was designed to convert a low amplitude 40KHz signal into a clean square wave signal. It will work with inputs as small as 5mv peak-to-peak or as large as 3 volts peak to peak. The input frequency can range from a few kilohertz to about 150 . . . [Hobby Circuit designed by David Johnson P.E., 02/18/06]

Links to electronic circuits, electronic schematics and designs for engineers, hobbyists, students & inventors:

Ten Khz VFC uses Charge Pump Variation - 04/09/98 EDN Design Idea (several circuits included, scroll the find this one) A diode-capacitor charge pump is the starting point for many voltage-to-frequency-converter (VFC] designs. The circuit in Figure 1 uses a variation on that classic theme to achi. . . [by Stephen Woodward, University of North Carolina, Chapel Hill, NC]

Ten-Cent Charge Pump Provides LCD Bias - Designing a product for low-power battery operation usually means maximizing the battery life by operating the circuit on as low of a supply voltage as possible. This design used a custom LCD but, due to the number of display segments (160) , a. . .

Touch Switch Exciter - If you have hundreds of touch switches that need an excitation signal, then this circuit is what you need. Its 20KHz 20v peak to peak output signal can supply up to 3 watts of touch switch excitation power . . . [Hobby Circuit designed by David Johnson P.E., 02/11/02]

Tripler converts 5 to 15V - 08/17/00 EDN Design Idea By configuring a charge-pump voltage doubler as a tripler, you can readily derive 15V from 5V (Figure 1). A 15V rail is useful for powering op amps, LCD-bias circuits and other low-current applications. The connections shown conf. . . [by Ken Yang, Maxim Integrated Products, Sunnyvale, CA]

Ultra Pure 125kHz Sine Wave Signal Source - For some RFID systems operating at 125KHz, a very low distortion signal source reference is needed. The circuit shown on this page produces a 10-volt peak-to-peak signal into a 50-ohm load, with a distortion of only 0. 01% . . . [Circuit by David A. Johnson P.E., 02/11/02]

Very Low Power Astable Multivibrator - This classic circuit draws only 200 nanoamps from a 1. 5v supply . . . [Circuit by Dave Johnson P.E., 06/10/00]

Very Low Power Gated Crystal Oscillator - The circuit gates the output of a continuously operating 32KHz crystal oscillator to the input of a C-MOS buffer when clock pulses are needed. The technique gets around the problem of a slow starting crystal oscillator by keeping the oscillator going and switching on a transistor power stage only as needed . . . [Circuit by David Johnson P.E., 06/03/00]

Voltage Boost to Series Regulator provided by Capacitor - This circuit adds some capacitors and diodes to a traditional transformer type series regulator circuit to extend the normal operating range. It can insure regulation during low line voltage conditions or it can squeeze a few more watts out of a plug-in-the-wall power adapter power supply . . . [Hobby Circuit designed by David Johnson P.E., 01/01/98]

Wide Band Zero Cross Detector - This circuit was designed to convert a low amplitude 40KHz signal into a clean square wave signal. It will work with inputs as small as 5mv peak-to-peak or as large as 3 volts peak to peak. The input frequency can range from a few kilohertz to about 150 . . . [Circuit by Dave Johnson P.E., 02/18/06]

Zero-Cross Detector-Wide Band - This circuit was designed to convert a low amplitude 40KHz signal into a clean square wave signal. It will work with inputs as small as 5mv peak-to-peak or as large as 3 volts peak to peak. The input frequency can range from a few kilohertz to about 150 . . . [Hobby Circuit designed by David Johnson P.E., 02/18/06]

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Charge Pumps: #-C D-N O-Z