18/07/2009 Achievements

Achievements today

• Tried simple Transistor "Not" gate. Didn't work.
• Tried Jaycar relay circuit to switch to "Not". Realised wouldn't work.
• Rummaged through shed, and got out old breadboard.
• Designed a "voltage divider", low wattage (but still not very efficient) to work a "not" on the SCR. So ... voltage is divided higher than 3.0v (actually, to 3.7v) so the SCR is normally on ... then if the vacuum switch sinks current, it basically short circuits the SCR (but through a resistor, so very low current) and turns off the SCR.
• It works ! Now just have to figure out how to solder it up "for real".
• Also did my eBay searches ... looking for the parts. Seems most likely that it will be the ATV ... because gokarts, even second hand, are too much money.