40-88 battery

[Philcofan]

Can anyone please tell me what type of battery eliminator
I can use for this. I can not tell from the schematic I have what the voltages I have. I think it is a 90v, 1 1/2 v but am unsure.

thanks
Chris

[jerryhawthorne]

Chris, if indeed it is a 90/1.5 V battery is is quite easy and inexpensive to build an A/C power supply and incase it in a box. Cover with graphics and it looks stock, other than an A/C cord coming out with an in-line switch on it.
I have done 2 of these and they were fun to build. Maybe $30 for all parts, most for the aluminium box and the the board. The other option is to buy a bunch of nine volt batteries and hook together for a total of 90V and a couple C cells for the 1.5. I always thought that was messy and I don't like replacing batteries. Attached is a pix of what I made for a couple of farm radios.
Jerry

[7estatdef]

Nice job Jerry!!!
Terry

[jerryhawthorne]

Thanks Terry, why someone wants to hook up all those batteries, well, one set plus something to mount them in, and if your going to use it, it gets a little pricey. The A/C power supply works very nicely and the radio shown, plays very nicely, with no hum at all. Wish I would have saved the graphics, it came from some U.K. website. Seems it has been closed down.
I'm certain someone saved this stuff. All parts I purchased from Mouser. The aluminum box was within fractions of an inch of the original battery. Had to do a little work on the computer to size properly. Making the female connector was easy. A piece of brass tubing and a small piece of thin plywood. An enjoyable project that worked well.

Jerry

[7estatdef]

Let me dig around a bit I should have the grafics on CD. I downloaded them a while back.
Terry

[Ron Ramirez]

Philcofan - yes, the original voltage of the battery was 1-1/2 volts for the "A" (filament) supply and 90 volts for the "B" side.

Jerry - I agree with Terry, nice work!