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MONOTYPE DAIRY

22-01-2004: 24 Volt direct current

Thursday January 22nd, 2004, par John Cornelisse


Old knowledge, from 3th class high-school, proofed to be not forgotten at all.

I have an old Ampere-meter, a real antique. 300 Ohm, 1 micro-ampere maximum. It is huge, old fashioned, made some in the old days: Holland was still proud with such a company like "Philips Gloeilampen Fabriek". Rare quality, hard to find today...

The meter is in black Backelite. An now obsolete polymere of formaldehyde. But also in itself a collectors-item today.

It has been idle for years now. Not any more... with about 2.5 MOhm resistor to limit the current through it. Mow it will indicate the 24 Volt Direct Current of the power-supply for the electronic valves.

It must have been 40 years ago, those lessons how to connect the parts around the meter. The appropriate calculations they just re-appeared when I needed them.

Still I’m not able to find a way to sent bytes to the interface, more than frustrating. Some guy over the Big Pond he offered his help. Assembler is not quite my cup of tea. Maybe he can find some solution.


Postcriptum


Notes


Dans la même rubrique :
30-01-2004: indentify the port
26 May 2004: casting sorts
17-01-2004: about Monotype code
Murphy’s Law and interfacing
31-01-2004: reprogramming IC
11-02-2004: testing and controlling...
01-03-2004: status of the Centronics-parallel port
11-01-2004: presentation of the interface
02-03-2004: start of a manual
03-03-2004: extension manual, producing margins



Wednesday November 22nd, 2017
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