Peter P. yahoo.com> writes: > A real gem. Pity there is no schematic available: > > http://www.wps.com/projects/instruments/Cubic-V45/index.html Are the schematics of these devices really gone ? The article says that the unit used only 27 transistors. I am *dying* to see a DVM schematic that uses 27 transistors and is accurate to 5 displayed digits. Where would one look for such paperwork ? The device described by Walter Banks is also very interesting. The spinning drum illuminated by a strobe was used before that for sonar and depth sounder display afaik. The National sonar chip (I don't remeber the code, it was in the special functions section in old catalogs) also expected to drive a similar display, with a neon strobe. Peter P. -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist