Medium Power 125khz Oscillator
This circuit adds even more inverters in parallel to deliver yet more power. The values shown are for 125KHz. . . Circuit by Dave Johnson P.E.-March, 2002
Medium Power 125khz Oscillator #2
This circuit is similar to MEDIUM POWER 125KHZ OSCILLATOR but adds even more inverters in parallel to deliver yet more power. The values shown are for 125KHz.. . . Circuit by David A. Johnson P.E.-March, 2002
Micro Power Over-Temperature Alarm
The circuit is powered for years by a single 3 volt lithium battery. It sounds an alarm when the temperature exceeds a certain point. With some minor changes the circuit could also be configured for an under temperature (freeze) alarm. The circuit uses a. . . Circuit by David Johnson P.E.-June, 2000
Modded charge pump extracts power from digital signal
EDN-Design Ideas 09/26/2015 At first glance, these charge pumps & voltage multiplier/inverters look conventional, but they have a trick up their sleeves__ Circuit Design by Luca Bruno & Duilio Pozzoni
New Charge Pumps offer Low Input & Output Noise
DN243 Design Notes __ Linear Technology/Analog Devices
New Step-Down Charge Pumps Are Tiny Efficient & Very Low Noise
DN310 Design Notes___ Linear Technology/Analog Devices
Night_Light_with_20_LED - After 3 years of continuous 24/7 operation I noticed that the 20 LED array I was using as a night light next to my back door was fading. Some of the LEDs were much dimmer than others. I figured that over time, the internal heat dissipated from the LED chip was causing the LED light intensity to fade. I decided it was time to replace the light. . . . Hobby Circuit by David Johnson P.E.-July, 2017
One 9 Volt Battery Gives +18 +25 +33V
This circuit is based on MAX1044 is a charge pump converter __ Designed by R.G. Keen
Over-Temperature Micro-Power Alarm
The circuit is powered for years by a single 3 volt lithium battery. It sounds an alarm when the temperature exceeds a certain point. With some minor changes the circuit could also be configured for an under temperature (freeze) alarm. The circuit uses a . . . Hobby Circuit designed by Dave Johnson P.E.-June, 2000
Peak to Peak 300v Signal Generator
This circuit converts a square wave signal to a +-150 volt output signal with fast 100nS rise and fall times . . . Hobby Circuit designed by David A. Johnson P.E.-June, 2000
Provides 5v Gate Bias from –48v
09/19/02 EDN-Design Ideas A small and simple circuit derives 5V from the -48V rail that telecomm applications typically use (Figure 1). Useful for gate bias and other purposes, the 5V supply delivers as much as 5-mA output current. A shunt reference__ Circuit Design by William Hadden
Pulsing Charge Pump Drives Capacitive Loads
11/05/98 EDN-Design Ideas (Several circuits here, scroll to find this one) The test circuit in Figure 1 efficiently drives various capacitive loads, such as memory cells and simple capacitors, so that you can observe their leakage effects. Essentially, the circuit is a pulsed and variable current source acting as a charge pump. A pulsed voltage source drives a one-shot oscillator__ Circuit Design by Paul J Rose, Mental Automation Inc, Bellevue, WA
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