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Circuits designed by David Johnson, P.E.
Last Updated on: Thursday, April 07, 2016 02:04 PM

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Touch Switch Circuits
Dave's Touch Switches, Page 1 - Page 2 - Page 3 - Page 4

 

1.5V Touch Activated Switch  -  A single 1.5v silver oxide button cell powers this complete touch activated switch circuit for 5 years.  It features both a normally open and a normally closed set of solid-state switch thermals.  It also has an adjustable sensitivity, which can be set for a touch capacitance change as small as 1 picofarad.… [Circuit by Dave Johnson P.E., 1/18/02]

1.5v Touch Activated Switch  -  A single 1.5v silver oxide button cell powers this complete touch activated switch circuit for 5 years.  It features both a normally open and a normally closed set of solid-state switch thermals.  It also has an adjustable sensitivity, which can be set for a touch capacitance change as small as 1 picofarad.… [Circuit by David A. Johnson P.E., 1/18/02]

10 Second Ultra Lower Power Oscillator  -  This circuit works much like the classic 555 timer, but draws only about 1.5 microamps from a 3 volt battery. It is highly stable under varying temperature and supply voltages… [Circuit by David A. Johnson P.E., 5/29/00]

10 Second Ultra Lower Power Oscillator  -  This circuit works much like the classic 555 timer, but draws only about 1.5 microamps from a 3 volt battery. It is highly stable under varying temperature and supply voltages… [Circuit by David A. Johnson P.E., 5/29/00]

120 VAC Touch Switch  -  This is a capacitance based touch on/touch off switch, which can control power to a 200 watt 120vac load… [Hobby Circuit designed by David Johnson P.E., 7/12/06]

12v Touch Switch Exciter Circuit  -  This circuit is designed to generate a 20KHz pseudo sine wave signal that can power about 50 remote touch activated switch circuits.  It can support a cable length of about 2500 feet.  A typical remote switch circuit is also shown as well as a receiver circuit for those switches.… [Circuit by Dave Johnson P.E., 2/10/02]

240VAC Touch Switch  -  This is another capacitance based touch on/touch off switch, which can control power to a 200 watt 240vac load… [Circuit by David Johnson P.E., 7/11/06]

240VAC Touch Switch  -  This is another capacitance based touch on/touch off switch, which can control power to a 200 watt 240vac load… [Hobby Circuit designed by Dave Johnson P.E., 7/11/06]

24v NiMH Battery Charger Using a 12v Solar Panel   -  A while back I received an email from a guy in the UK.  He wanted to use a small solar panel, designed to charge 12v lead acid batteries, but use it to charge a 24v battery pack.  His 24v battery pack used 20 AA size NiMH cells.  He went on to explain that his 20 cell NiMH battery pack was used very infrequently… [Hobby Circuit designed by David Johnson P.E., 10/12/11]

24v NiMH Battery Charger Using a 12v Solar Panel   -  A while back I received an email from a guy in the UK.  He wanted to use a small solar panel, designed to charge 12v lead acid batteries, but use it to charge a 24v battery pack.  His 24v battery pack used 20 AA size NiMH cells.  He went on to explain that his 20 cell NiMH battery pack was used very infrequently… [Hobby Circuit designed by David Johnson P.E., 10/12/11]

24-Volt AC Powered Isolated +5V Supply  -  24vac is a very popular power supply in many industrial systems.  It is often used in systems that involve water.  It is also popular with many inside and outside lighting systems.  The lower voltage means the danger of human electrocution is much less.  … [Hobby Circuit designed by Dave Johnson P.E., 7/29/09]

3v Capacitance Proximity Switch  -  This circuit was designed to provide a touch activated switch function without an external power supply.  It draws so little power that a single 3v battery will operate the circuit for many years… [Circuit by Dave Johnson P.E., 2/12/02]

5v Touch Switch  -  This simple circuit uses a single IC to form a nice touch switch circuit.  A single transistor forms the remote active switch sensor.  Multiple switches can be wired in parallel.  The switch circuit can be located about 500 feet from the control circuit… [Hobby Circuit designed by David Johnson P.E., 3/12/02]

5w Fluorescent Lamp Intensity Modulator  -  The circuit was designed to experiment with using small fluorescent lamps as a broad pattern source of modulated light. The circuit hits the small lamp with narrow 1us pulses at a rate of 10KHz. Each pulse launches about 10 watts of visible light. The lamp… [Circuit by Dave Johnson P.E., 6/27/00]



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