Re: Variable AC supply
Chiming in on ad-hoc variable AC supplies.toggle quoted messageShow quoted text
We were building an automated mastering console that used 8080 processors. Development was done on an IMSAI 8080 computer and we needed a printer to printout the assembly language source code. All we had was an ASR 33 tele-type that refused to print properly. In abject frustration I hooked up a Tektronix 465 scope (Notice how I’m keeping this on topic.) and looked at the letter ‘A’ coming from the computer and the letter ‘A’ coming from the tele-type. It was then I noticed a 20% difference in the overall timing of the character. I pulled off the cover and in big letters on the tele-type motor was 50Hz. I went to the shop and got a Crown DC300 amplifier, transformer, and an HP 3310A function generator that I set to 50 Hz. Everything now worked. My memory is good because I took a picture of this screwball setup.
On Feb 21, 2019, at 9:36 AM, Roy Morgan <k1lky68@...> wrote: