noise: [Noisebridge-discuss] re Dynamo Regulator Help

Johny Radio johnyradio at
Mon Jul 22 01:33:00 UTC 2013

On 7/21/2013 6:20 PM, Henner Zeller wrote:
> are the motors identical ? If so, then the motor probaly generates a 
> voltage in a similar order of magnitude (minus the losses).

yes. what are the losses?

> >>If you voltage is _way_ to high (which I suspect is happening here), 
> then you can blow the input stage

if the input stage op amp blows from over-voltage on the input, would 
the power amp chip still be protected?

> If the motor doesn't work anymore, something blew inside.

that much i figured out.

> Maybe one winding is gone ? Or there are overvoltage protection diodes 
> that fried. Or some mechanical failure in the commutator. 60000 RPM is 
> pretty high.

6,000, not 60,000

>  If it looks like a sine with one side folded over to the top (so more 
> like camel humps), then it is the commutated output (so: a DC motor).
> If you can operate the motor with DC, it is a DC motor.

def a DC motor, but not seeing a rectified sine on the scope. Seeing two 
super-imposed sines on the scope, which seems impossible. But if the 
motor is outputting ten's of volts, then maybe i'm overdriving the 
scope, and it's readings are inaccurate.


Johny Radio

Stick It In Your Ear!

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