I built a second oscillator but this time on a much smaller circuitboard and included, on the same board, a power supply that takes 12v DC from your vehicle and steps it down to 5v DC regulated. Along with the voltage regulator (an LM7805) and a 220uf 35v capacitor (cushioning to help clean up the regulated output), I've added a resistor to the power output from the new power supply to drop it to 3v DC to match what the external battery pack provides. I did not eliminate the battery pack and it remains an option, in the event you'd want to use it instead of utilizing the 12v DC from your vehicle's electrical system. The oscillator is virtually the same as before with the exception of an IC socket having been added so that the 555 IC isn't soldered directly on the circuitboard.
For views, see: http://www.freewebs.com/jhines2/apps/photos
The COSM now can send oscillated or non-oscillated voltage and can operate either on its external battery pack or off of your vehicle's 12v DC electrical system.
I need to update the wiring diagrams on my Freewebs site to reflect this new addition. The re-wiring is very minimal. All I've done is add another incoming wire to the COSM for 12v DC input, then wired the new power supply's positive lead to the positive terminal used by the external battery pack, so they can share the same pathway, wired the power supply negative lead to the vehicle's ground, then wired the oscillator's pulsed output to the O2 signal output wire. I'll update the diagram to make this a bit clearer.
See: http://www.freewebs.com/jhines2/apps/photos
for views of the new circuit. You CAN build this! More enhancements to come.
HHO fuel cell New oscillator circuit pwr supply
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