Scary Terry sound to servo board

[LightUpMA]

Is there a way to test voltage on the 3 pins for the servo? To see if output is correct.

[tstraub]

Pin 3 of the servo header is a PWM signal and would require a scope to get a proper reading. I have been looking at your picture and am having trouble following the wiring. Its difficult to tell where all of the wires go. I see several very large solder blobs that may be shorts but I cant tell for sure. I think the best thing to do at this point is get a meter out and start taking some readings.

you should have 5 volts at the following places:
LM4558 pin #8
4066 pin #14
555 pin #4 and 8

with the power disconnected you should have 0 ohms of resistance to ground at the following places:

LM4558 pin #4
4066 pins 2,5,6, and 7
555 pin 1

[hollandlihjtdisplay]

Is there a way to test voltage on the 3 pins for the servo? To see if output is correct.

Yea 2 pins should be power, and one signal.
B= -
R= +
Y= Signal
You can use a voltage meter to make sure the voltage is correct by sticking the probes on B and R. But y requires a different tactic.

[LightUpMA]

Pin 3 of the servo header is a PWM signal and would require a scope to get a proper reading. I have been looking at your picture and am having trouble following the wiring. Its difficult to tell where all of the wires go. I see several very large solder blobs that may be shorts but I cant tell for sure. I think the best thing to do at this point is get a meter out and start taking some readings.

you should have 5 volts at the following places:
LM4558 pin #8
4066 pin #14
555 pin #4 and 8

with the power disconnected you should have 0 ohms of resistance to ground at the following places:

LM4558 pin #4
4066 pins 2,5,6, and 7
555 pin 1

Well the big blobs are solder bridges between two points close by that are suppose to be connected. I'm so frustrated lol. I remember reading a while back about a board house that will build small boards I think 3x3 for low fees. About to have one made up.

I'll do those tests u suggested and then make sure no solder bridges.

Thanks again Tyler!

[LightUpMA]

.

you should have 5 volts at the following places:
LM4558 pin #8
4066 pin #14
555 pin #4 and 8

with the power disconnected you should have 0 ohms of resistance to ground at the following places:

LM4558 pin #4
4066 pins 2,5,6, and 7
555 pin 1

I have 5 volts at all those places but oddly I tested red and black pins for servo output and found 9v!

[LightUpMA]

Pin 3 of the servo header is a PWM signal and would require a scope to get a proper reading. I have been looking at your picture and am having trouble following the wiring. Its difficult to tell where all of the wires go. I see several very large solder blobs that may be shorts but I cant tell for sure. I think the best thing to do at this point is get a meter out and start taking some readings.

you should have 5 volts at the following places:
LM4558 pin #8
4066 pin #14
555 pin #4 and 8

with the power disconnected you should have 0 ohms of resistance to ground at the following places:

LM4558 pin #4
4066 pins 2,5,6, and 7
555 pin 1

Got it! Looks like the ground to the 3rd pin for servo output wasnt quite right. Thank u sooo much!! I'll send u a pic when its up an running.

Also can I submit a mirror image of board layout for ur wiki? I think having to reverse what I'm looking at to wire it caused the mistake. As soon as I was looking at the mirror image it became clear.

[LightUpMA]

Here's a picture of the servo board (mirror image), as you would view it from the back for wiring purposes.


servoboard_reverse.jpg

[tstraub]

I'm. Glad to hear you got it working