Quote Originally Posted by Larken View Post
What you want is for the Amp to be disabled until the Step2lin enables it.
This is because when power is applied to the Step2lin, the analog outputs jump around for a split second as the step2lin cpu is initializing the D-A converter. After the analog is stable the step2lin then brings the enable low.

Thats why i use a relay contact that is normally closed when there is no power to it.
If the Enable input on the amp is Disabled when pulled high through a resistor, that would work. But you could'nt use the step2lin PowerSupply to pull it high.

Larry
Hi Larry,
Understood. However why the need for the relay. My Glentek servo amp has a logic level of 5V, when sunk to the common pin of the amplifier would enable it. Can I avoid using the relay?
I sent you the docs on the Glentek Servo amp sometime ago.

Thanks Larry.
Marty