Re: Parallel port power increase

Randy,

1.5V doesn't sound right at all for an output. It does sound about
right for an input though.

Are you using a scope to read the output? A voltmeter will average a
digital output to its mean value. Try toggling the direction output;
a meter will give a truer reading then.

If you read 0V and 5V then it's a true TTL output. If it reads 0V and
3.3V then it is not and will need a buffer.

Mariss

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "m0nkey0ne" <m0nkey0ne@y...>
wrote:

> Hi all, I have to start a new chain here on my project. I have my
> M57-102 Compumotor and Driver connected to port 2 through 5 on my
> parallel port on my laptop. I have a .dll file in my systems

folder

> and call it from a program I am building on VB6. The motor is
> receiving a signal because it moves slighty as instructed, however
> the port is not going high, only to about 1.5 volts. Is there a
> schematic for using MOSFETs or iso-optical transistors, (I only

have

> a vague idea of what the heck I'm talking about), that will send
> higher voltage from a higher powered source? I expect to use a 5 V

DC

> power source so shouldn't need the circuitry to control that.
>
> Thanks in advance. And keep up the good work....there is a lot of
> wisdom in these pages. Thanks, Randy