[GreenKeys] Changing speeds on a Lorenz Lo-15b

[Jeffrey D Angus]

Some parts are on order, others have already arrived.
The motor for the Lorenz has 11 spots on the back used to setting the
speed with either a tuning fork or a strobe light.
These <http://www.ebay.com/itm/301725900233> should be perfect
for reading the RPM.
495 Hz at 66 WPM and 450 Hz at 60 WPM.

I'm waiting on a spare motor to arrive so I can work out the details
without having to take my machine "off line" in the process.

The basics of the design are based on using this as a replacement for
the centrifugal switch.
<http://zpostbox.ru/frequency_comparator_circuit.html>
Then using a reference oscillator and a divide by n counter in place of
the re-triggerable one shot. Then using a solid state relay to switch the
original series resistance in and out of the circuit for the speed control.

As they say on another mailing list I subscribe to, "We do this for fun!"

Jeff

-- 
Jeff-1.0
wa6fwi
http://www.foxsmercantile.com

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