Maker Pro
Maker Pro

Stage Line 500W amp repair project

bikemech

Oct 23, 2014
456
Joined
Oct 23, 2014
Messages
456
The box only has 1 BNC input for the 1 probe, and 1 audio jack as the output to the soundcard/laptop,
I do have meter leads with crock clips and do have a BNC to crock clip lead
 

bikemech

Oct 23, 2014
456
Joined
Oct 23, 2014
Messages
456
The probes i have are said to 100Mhz , does this mean that it there capable limit?, i think i had my sig gen much higher than that
 

bertus

Moderator
Nov 8, 2019
3,303
Joined
Nov 8, 2019
Messages
3,303
Hello,

Your signal generator can generate signals upto 500 kHz.
The 100 MHz probe will have no problems.
The soundcard scope can handle signals upto 20 kHz.

Bertus
 

WHONOES

May 20, 2017
1,217
Joined
May 20, 2017
Messages
1,217
O.K. You should still be able to carry out the battery check I suggested. You can, as you suggested, measure the output at the headphone jack using your DMM.
 

bikemech

Oct 23, 2014
456
Joined
Oct 23, 2014
Messages
456
At 1:1
I get 1.402vdc
That is with the positave probe on the base of the audio jack and the negative probe on the second connection point along, the BNC to crock clips have red and black clips, i set red to + and black to --,
I am wondering if i have the connectiong reversed to the phono jack
 

bikemech

Oct 23, 2014
456
Joined
Oct 23, 2014
Messages
456
I currently have it wired, green to pin 3, and yellow to pin 4,
See second diagram below4-pin 3.5mm headset connector.png
 

WHONOES

May 20, 2017
1,217
Joined
May 20, 2017
Messages
1,217
Ok. That's all reasonable. Your box seems to be working.
Have you tried it with you virtual scope recently?
 

bikemech

Oct 23, 2014
456
Joined
Oct 23, 2014
Messages
456
I think i see the issue here, with another set of headphones the computer sees the mic and lets me select it, with the lead i have cut up it does not!,
Is it possible it has something to do with the small board the MIC is attached to on the headphone lead ?
 

bertus

Moderator
Nov 8, 2019
3,303
Joined
Nov 8, 2019
Messages
3,303
Hello,

Could it be that 3 and 4 are exchanged?
When you measure the speaker between 1 and 4, 4 is the ground.
When you measure a high value between 1 and 4, 3 is the ground.

Bertus
 

WHONOES

May 20, 2017
1,217
Joined
May 20, 2017
Messages
1,217
Can you determine the maker of the sound card in your computer. If so we may be able to get some info on it and see where the hiatus is.
 

bertus

Moderator
Nov 8, 2019
3,303
Joined
Nov 8, 2019
Messages
3,303
Hello,

As for the scope, have a look at the attached document.

Bertus
 

Attachments

  • DSO150_instructions(D01).pdf
    421.3 KB · Views: 4
Top