Watson, Ive been building inverters/converters for 35 years with my first using a large ribbon toroid. I used it to repower an old Sony table stereo for use in my 6 Volt VW camper. It used a feedback winding but, after that, I just use cross coupling resistors or caps, with resistors alone usually being adequate. On my current low power converters, I started employing germanium diode bridges in the output. It helped out by increasing the output by a few tenths of a volt. With the starting usable output only a couple of volts, it made for good percentage increase!
I made one like that, too. It used a Deltamax or Hypersil core, I forget which, and two germanium power transistors. It made a great Dc to Dc converter, but the frequency was low, maybe a few kHz, and the constant whine was bothersome.
I remember one guy had a CB set with negative ground, so he had someone make up a bracket and added a second alternator and battery to his positive ground vehicle.
Later I built a DC to DC converter and mounted it in the battery compartment of a cheapo DMM. It works okay, and now I don’t have to spend an arm and a leg on 9V batteries. Here’s a link to the blog. http://rustybolt.info/wordpress/?p=7516
Watson, Ive been building inverters/converters for 35 years with my first using a large ribbon toroid. I used it to repower an old Sony table stereo for use in my 6 Volt VW camper. It used a feedback winding but, after that, I just use cross coupling resistors or caps, with resistors alone usually being adequate. On my current low power converters, I started employing germanium diode bridges in the output. It helped out by increasing the output by a few tenths of a volt. With the starting usable output only a couple of volts, it made for good percentage increase!
I made one like that, too. It used a Deltamax or Hypersil core, I forget which, and two germanium power transistors. It made a great Dc to Dc converter, but the frequency was low, maybe a few kHz, and the constant whine was bothersome.
I remember one guy had a CB set with negative ground, so he had someone make up a bracket and added a second alternator and battery to his positive ground vehicle.
Later I built a DC to DC converter and mounted it in the battery compartment of a cheapo DMM. It works okay, and now I don’t have to spend an arm and a leg on 9V batteries. Here’s a link to the blog.
http://rustybolt.info/wordpress/?p=7516