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Patent Application for a
Touch-Sensitive Electronic Switch
from March 1993.

(Something went awry with the scanner at the bottom of this page.)

This original circuit was a little more prone to the possibility of being falsely triggered, due to the 'floating' sensing point 'C'.  I used the 10uf electrolytic capacitor to try and suppress any e/m pulses liable to turn the NPN transistor on.  The design of my latest circuit overcomes this by simply 'tying' the base of the PNP high with a 330k resistor (or similar) and using the 0.01uf capacitor (or similar) to decouple any interference.

Another feature of this circuit which I've managed to eliminate in the latest model is the necessity for it to be earthed for it's operation.  Control of certain load types can be achieved, providing :

  The load you desire to control with this product has a fairly low resistance - ie a coil from a relay or starting solenoid.

  The load does not get interrupted during the course of it's normal operation.

  The load is not so high or applied for so long a period so as to cause over-heating of the output semi-conductor.

Note: A separate 'keep alive' resistor of low enough resistance to maintain the thyristors hold current may be employed for the control of interrupted load types whose operating current is insufficient to cause overheating.  I strongly recommend the individual testing of any such application external to the vehicle prior to installing as I have not designed the unit to handle the prolonged operation of load currents larger than a standard relay.

In the limited amount of testing I've done on the latest model, in all the cases so far where I have activated the G-Spot in a vehicles starting solenoid circuit with the vehicles starter motor disconnected, the solenoid has always heated up more than the G-Spot.  I cannot guarantee that for this particular model G-Spot  that this will always be the case, given the variety of vehicles and starting solenoids available, but it is rather extreme for a solenoid to be continuously operated for more than 3 minutes.

As my original design used solely leaded components ie not the smaller surface mounted equivalents - and there were more of them, it required the larger housing of the 20mm square aluminium tubing pictured.  This packaging design, while exceptionally robust and providing excessive heat-sinking, had a lengthy and involved manufacture process and took considerably longer to install.  Have you ever tried pouring resin into a piece of hollow tubing while not having it fall out the other end, yet still have the wire coming out too?

Copyright July 30th, 2001, Daniel Davies
G-Spot was a Trademark of Daniel Davies (aka Daniel Morgan)
Manufacturing Rights as per my Instructional Animation Now Licensed 
to Students Attending an Educational Institution or Individuals in a Private Dwelling, 
Subject to My Terms & Conditions and Disclaimer All Other Rights Reserved

NZ Patent Application # 510157
Last Modified 14th May, 2011

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