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Sensors / Detectors: Capacitance / Touch Switch Circuits
Capacitance Switches:   #'s       A-R         S-Z

Sensors / Detectors Main Page
Last Updated on:
Friday, August 21, 2015 06:59 AM

Circuits Designed by Dave Johnson, P.E. :
  • 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.,  01/18/02] 
     

  • 120 VAC Touch Switch -  This is a capacitance based touch on/touch off switch, which can control power to a 200 watt 120vac load . . . [Circuit by David Johnson P.E.,  07/11/06] 

  • 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 David A. Johnson P.E.,  02/10/02] 

  • 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.,  07/11/06] 

  • 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] 

  • 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.,  02/12/02] 

  • 5v Capacitance Touch Activated Momentary Switch -  This circuit is discussed in more detail in the section on Capacitance Proximity Switch Technology. The circuit is powered from a standard +5v supply. It has both a source and sink output that change state whenever a metal button connected to the circuit . . . [Circuit by David Johnson P.E.,  07/08/00] 

  • 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 A. Johnson P.E.,  03/12/02]


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

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.,  01/18/02]

 

101 Seconds Duration On Switch with Touch Control -  This is a touch control switch which keeps the circuit on about 100 seconds after touching the plate connected to the 2 numbered pin. At the end of this time duration, relay releases and the circuit gets to off position. The impedance of the trigger input of the 555 timer IC is very high and the inductive voltage on the human body is enough to trigger it. The circuit works based on this principle. You can use a piece of metal as a plate. The circuit can be used in toy circuits, buzzers or any project that is suitable. You can adjust the duration time by changing the R1 and C1 values. . . . 

 

120 VAC Touch Switch -  This is a capacitance based touch on/touch off switch, which can control power to a 200 watt 120vac load . . . [Circuit by David Johnson P.E.,  07/11/06]

 

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 David A. Johnson P.E.,  02/10/02]

 

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.,  07/11/06]

 

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]

 

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.,  02/12/02]

 

5 Volt Momentary Operation 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 . . . [Circuit by David A. Johnson P.E.,  03/12/02]

 

5v Capacitance Touch Activated Momentary Switch -  This circuit is discussed in more detail in the section on Capacitance Proximity Switch Technology. The circuit is powered from a standard +5v supply. It has both a source and sink output that change state whenever a metal button connected to the circuit . . . [Circuit by David Johnson P.E.,  07/08/00]

 

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 A. Johnson P.E.,  03/12/02]

 

 

 


Capacitance Switches:   #'s       A-R         S-Z
 


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