- Welcome to madbeanpedals::forum.
Recent posts
#1
Open Discussion / Re: Spring cleaning
Last post by djaaz - Today at 09:23:50 AMQuote from: mjg on Today at 04:22:25 AMI'm currently on an island in the middle of the Indian Ocean, can recommend.20 hours of flying, i was supposed to go in Sydney and Melbourne over 2 weeks this summer for work. I chickened out bc of the flight duration.
Looks like a good one wat trip.
#2
Open Discussion / Re: Spring cleaning
Last post by mjg - Today at 04:22:25 AMI'm currently on an island in the middle of the Indian Ocean, can recommend.
#3
Global Annoucements / Re: 2024 outlook
Last post by Funkasaurus - Today at 04:08:21 AMAny chance the 14mm clear shaft pot adapters are going to be restocked soon/ever?
#4
Open Discussion / Re: Spring cleaning
Last post by djaaz - July 15, 2024, 10:33:37 PMQuote from: pierre67 on July 15, 2024, 07:29:59 PMCould be an island in the middle of the pacific oceanQuote from: djaaz on July 15, 2024, 07:17:09 PMsomewhere in south america?
where in south america?
#6
Open Discussion / Re: Spring cleaning
Last post by gordo - July 15, 2024, 09:35:18 PMI hear you, but be careful what you wish for :-)
#7
Tech Help - Projects Page / Re: Total Recall (2024) - No d...
Last post by thomasha - July 15, 2024, 09:14:54 PMIt seems more like a bad joint somewhere. You have a lot of pins with voltages as low(high, because its negative, but you get the point) as -1.3v. The bias of the gain stages will be way off and as a result signal will not pass or only barely, distort, and so on.
Before we blame the BBDs I would remove them from the board and check that the signal chain to their input is working.
My suggestion is, check where the voltages are way off and look for those points in the schematic. Any part could be missing a connection, and, as a result the voltage is way lower(higher).
I would definitely try changing the capacitor, if you think that might be the problem.
As Brian said, check around the NE570, its bias is way off, and that might affect everything that comes afterwards, like IC3A and IC5B.
I know this might be annoying, but check continuity with a multimeter between the surrounding parts and some of you solder joints. Some of them look very suspicious, with large blobs of solder.
R38 is also difficult to check, its small and I can only see 3 bands, and one is green?
Isn't the bias of the NE570 set by that resistor? 11k to inverting input?
Before we blame the BBDs I would remove them from the board and check that the signal chain to their input is working.
My suggestion is, check where the voltages are way off and look for those points in the schematic. Any part could be missing a connection, and, as a result the voltage is way lower(higher).
I would definitely try changing the capacitor, if you think that might be the problem.
As Brian said, check around the NE570, its bias is way off, and that might affect everything that comes afterwards, like IC3A and IC5B.
I know this might be annoying, but check continuity with a multimeter between the surrounding parts and some of you solder joints. Some of them look very suspicious, with large blobs of solder.
R38 is also difficult to check, its small and I can only see 3 bands, and one is green?
Isn't the bias of the NE570 set by that resistor? 11k to inverting input?
#8
Tech Help - Projects Page / Re: Total Recall (2024) - No d...
Last post by Bumfluff101 - July 15, 2024, 08:03:06 PMChecked everything and replaced a couple of resistors but still no change.
I've ordered another PCB and will give it another shot.
One query I had was that for C8 the cap reads -15.3v on the negative leg and -1.34 on the positive leg which then feeds pin one of ic2. Does this mean the cap is the issue? This is one I hadn't changed but not sure whether it's worth it now?
I've ordered another PCB and will give it another shot.
One query I had was that for C8 the cap reads -15.3v on the negative leg and -1.34 on the positive leg which then feeds pin one of ic2. Does this mean the cap is the issue? This is one I hadn't changed but not sure whether it's worth it now?
#9
Open Discussion / Re: Spring cleaning
Last post by pierre67 - July 15, 2024, 07:31:23 PMQuote from: djaaz on July 15, 2024, 07:17:09 PMdo you also feel like setting the whole thing on fire...please don't burn the Cascadia !
#10