madbeanpedals::forum

Projects => Tech Help - Projects Page => Topic started by: rcz53 on March 20, 2014, 11:50:46 PM

Title: mayo voltages please on mudbunny
Post by: rcz53 on March 20, 2014, 11:50:46 PM
wanting to check voltages on my mayo/mudbunny build. trannys q3 and q4 have to be reversed or the sound is gated. I'm using BC 550c's which have a different pinout than the 2N5088 so Q1 and Q2 are installed flipped 180 degrees but the weird part is q3 and 4 are installed as per the silk screen indication on the board. The sound is pretty good but I fear something is a miss. What are the suggested voltages please.
Title: Re: mayo voltages please on mudbunny
Post by: Blues Healer on March 21, 2014, 04:21:08 AM
http://www.madbeanpedals.com/forum/index.php?topic=11828.msg106898#msg106898
Title: Re: mayo voltages please on mudbunny
Post by: madbean on March 22, 2014, 11:58:59 AM
That is strange. Can you tell me your voltages on the Q3 and Q4 transistors? Are they socketed? Have you tried putting in any other transistor there, such as a 2n5088?

I checked my Eagle file and the transistor pinouts are correct for sure.
Title: Re: mayo voltages please on mudbunny
Post by: rcz53 on March 25, 2014, 01:04:58 AM
Thanks madbean... Issue is resolved. I had a 100k resistor instead of 10k as intended at R22. Circuit sounds great and yes the transistors are socketed so now I can try the  5088's too! Thanks for a very cool forum and projects.
best regards