madbeanpedals::forum

Projects => Tech Help - Projects Page => Topic started by: thrillhouse on February 28, 2018, 10:53:46 PM

Title: Harbinger One lamp steady but rate LED flashing correctly
Post by: thrillhouse on February 28, 2018, 10:53:46 PM
Hey there everyone! Been trouble shooting my harbinger build on and off for a week or two but now I feel like I've hit a wall! So the issue I am seeing is that the rate LED on the harbinger flashes properly and responds as it should to adjustments of the speed pot however the lamp itself only glows steadily; no pulsing at all. I've double checked my speed pot wiring and spent most of my time focusing on the LFO section of the circuit. I haven't been able to find/see any drastic voltage drops on any of the components in the section so I am assuming everything is flowing correctly? Here are the reading i took off the LFO section:

Q11
C 15.79
B Variable between 6-8
E Variable between 8-9

Q12
C 15.78
B Variable between 8-9
E Variable between 6-9

Q13
C 12.2
B 3.0
E 2.3

Now I have to mention that I do have a mix of carbon and metal resistors in the R41-R46 row because I had some left over
in my parts bin but they're rated the same so I assume that's ok? Any guidance would be greatly appreciated and please let me know if you need anymore information.
THANK YOU IN ADVANCE!!!!
Title: Re: Harbinger One lamp steady but rate LED flashing correctly
Post by: emakris on March 01, 2018, 12:40:33 PM
Hi,

Can you post a pic of the board?
Q13 is the one to socket and try a different transistor if you have some spares.

Thanks
Ernie
https://www.geargasstore.com
Title: Re: Harbinger One lamp steady but rate LED flashing correctly
Post by: thrillhouse on March 02, 2018, 09:49:40 AM
Thanks for the reply Ernie! An interesting (and frustrating) development has occurred though as of yesterday. I went down to the bench last night to take pictures for you and found that I accidentally left the pedal plugged in. Low and behold the lamp was now flashing away! I'm happy it mysteriously started working for some reason but also kind of annoyed because I really wanted to figure out what was going wrong with it!!! If anything changes I'll send an update.
Title: Re: Harbinger One lamp steady but rate LED flashing correctly
Post by: emakris on March 02, 2018, 12:29:06 PM
Hi,

Excellent! That's great to hear!!!

Thanks
Ernie
https://www.geargasstore.com
Title: Re: Harbinger One lamp steady but rate LED flashing correctly
Post by: gordo on March 02, 2018, 06:54:09 PM
Damn those are frustrating troubleshoots though.  You don't want to touch it cuz it works, but you want to figure out what it was so it doesn't happen again...
Title: Re: Harbinger One lamp steady but rate LED flashing correctly
Post by: blearyeyes on March 03, 2018, 10:19:26 PM
Thanks for the reply Ernie! An interesting (and frustrating) development has occurred though as of yesterday. I went down to the bench last night to take pictures for you and found that I accidentally left the pedal plugged in. Low and behold the lamp was now flashing away! I'm happy it mysteriously started working for some reason but also kind of annoyed because I really wanted to figure out what was going wrong with it!!! If anything changes I'll send an update.

I hate it when gremlins come in and fix stuff without telling you.