A DC-DC inverter able to convert unregulated 12V DC input to 16V DC at a rated 1.6A. With a heatsink it seems to cope fine driving loads at up to 2.1A.
I originally built this little inverter to power/charge my VAIO PCG-C1X Picturebook laptop from the 12V supply of my motorcycle. It's also been useful for extending the otherwise woeful battery life of the VAIO itself when used in conjunction with a decent lead-acid battery.
I take no responsibility for what you do to your VAIO, blah blah blah...
Since then, I've received this info from the C1-Forum mailing list (thanks to Bob Hawbaker) :
Date: Mon, 26 Jun 2000 11:34:12 -0500 From: "Terry J. Neville"
Organization: Lind Electronics, Inc. Subject: Re: Power Supply for Sony C1X/505 We obtain our pre-molded cable and connector from a company in the far east. It's called a #MP205 connector. I have not seen it sold in local retails either. If someone wishes to purchase one of our premolded cables we can make them available by calling #800-659-5956 at $6.00 each plus shipping. Please note that the newer #PCG-C1X Sonys now use a rectangular connector and we have not been able to source that one yet. Thanks, Terry Neville
The whole PCB fit snugly into a small plastic bulkhead mounting case with wire inlets that I found locally at Jaycar.
Refer to the photos and the schematic diagram below for construction details. Note the small aluminium plate bolted between the regulator tab and the case, forming a heatsink. The bolt holds the entire circuit inside the case.
A switch inside the voltage regulator closes between pins 4 and 3, causing current to flow through the inductor to ground. When the switch is released a few microseconds later, a back-EMF 'kick' is produced by the inductor, resulting in a positive pulse with respect to the input voltage. This pulse charges the output capacitor via the schottky diode, which tends towards an equilibrium voltage.
The switch continues to oscillate,
the diode preventing the switch from shorting the output capacitor
during the 'on' phase. The output voltage is monitored via the
voltage divider R1/R2, causing the duty cycle of the switch oscillator
to be continuously regulated in order to maintain a constant output voltage
under varying loads.