Title: Greenbean - question on Volume
Post by: Vivek_rc on April 13, 2020, 09:17:57 AM
Post by: Vivek_rc on April 13, 2020, 09:17:57 AM
Hi All,
I just completed a greenbean 2019 build and was testing it, and it seems to working and getting an overdrive sound. However the volume seems to be on the low side, it's not much louder even setting volume pot at max, the controls work and drive pot does overdrive the signal, clipping also changes the sound. I've measured all the voltages and everything checks out. Was hoping to get some advice if anyone has faced a similar situation.
Many thanks
Vivek
(https://uploads.tapatalk-cdn.com/20200413/b6c971bb44d0a9e56b9964d9138d43f0.jpg)
(https://uploads.tapatalk-cdn.com/20200413/6a6360c9b80b39603d8bca230db3021a.jpg)
I just completed a greenbean 2019 build and was testing it, and it seems to working and getting an overdrive sound. However the volume seems to be on the low side, it's not much louder even setting volume pot at max, the controls work and drive pot does overdrive the signal, clipping also changes the sound. I've measured all the voltages and everything checks out. Was hoping to get some advice if anyone has faced a similar situation.
Many thanks
Vivek
(https://uploads.tapatalk-cdn.com/20200413/b6c971bb44d0a9e56b9964d9138d43f0.jpg)
(https://uploads.tapatalk-cdn.com/20200413/6a6360c9b80b39603d8bca230db3021a.jpg)
Title: Greenbean - question on Volume
Post by: Vivek_rc on April 13, 2020, 11:00:35 AM
Post by: Vivek_rc on April 13, 2020, 11:00:35 AM
I think I might have found an issue :) for some reason I put in the wrong capacitors for the 1uf!! Realised when I looked at the pictures I posted on this forum! Will replace them and see if there is a difference
Update: replaced the capacitors with 1uf caps and it's still the same, volume is still at the same level.
(https://uploads.tapatalk-cdn.com/20200413/12ab5ea5197080c495984d756e8d8b34.jpg)
Update: replaced the capacitors with 1uf caps and it's still the same, volume is still at the same level.
(https://uploads.tapatalk-cdn.com/20200413/12ab5ea5197080c495984d756e8d8b34.jpg)
Title: Re: Greenbean - question on Volume
Post by: jimilee on April 13, 2020, 01:44:08 PM
Post by: jimilee on April 13, 2020, 01:44:08 PM
Check all your other parts and reflowed yet?
Sent from my iPhone using Tapatalk
Sent from my iPhone using Tapatalk
Title: Re: Greenbean - question on Volume
Post by: alanp on April 13, 2020, 04:50:07 PM
Post by: alanp on April 13, 2020, 04:50:07 PM
Did you use a substitute for Q1 and the bottom right one? I notice that the transistors there are oriented the opposite way to the silkscreen.
Title: Re: Greenbean - question on Volume
Post by: Vivek_rc on April 13, 2020, 08:24:16 PM
Post by: Vivek_rc on April 13, 2020, 08:24:16 PM
Quote from: alanp on April 13, 2020, 04:50:07 PMHi Alanp, I used BC550s and from the data sheet they should be orientated so that pin 3 is the emitter. I will try to reflow all solder points again and see if it makes a difference
Did you use a substitute for Q1 and the bottom right one? I notice that the transistors there are oriented the opposite way to the silkscreen.
Sent from my iPhone using Tapatalk
Title: Re: Greenbean - question on Volume
Post by: Vivek_rc on April 13, 2020, 08:25:02 PM
Post by: Vivek_rc on April 13, 2020, 08:25:02 PM
Quote from: jimilee on April 13, 2020, 01:44:08 PMWill try to do a reflow
Check all your other parts and reflowed yet?
Sent from my iPhone using Tapatalk
Sent from my iPhone using Tapatalk
Title: Greenbean - question on Volume
Post by: Vivek_rc on April 13, 2020, 11:55:04 PM
Post by: Vivek_rc on April 13, 2020, 11:55:04 PM
Reflowed the solder points again and now the volumes come up, it sounds good. Had to go over once and then again on the clipping switch.
Than you Alanp for the advice and guidance
Sent from my iPhone using Tapatalk
Than you Alanp for the advice and guidance
Sent from my iPhone using Tapatalk
Title: Re: Greenbean - question on Volume
Post by: gordo on April 14, 2020, 12:00:36 AM
Post by: gordo on April 14, 2020, 12:00:36 AM
Excellent!
Title: Re: Greenbean - question on Volume
Post by: jimilee on April 14, 2020, 02:11:13 AM
Post by: jimilee on April 14, 2020, 02:11:13 AM
Quote from: Vivek_rc on April 13, 2020, 11:55:04 PMGreat to hear. I had to do that last week with a couple of builds. I get over confident in my soldering from time to time.
Reflowed the solder points again and now the volumes come up, it sounds good. Had to go over once and then again on the clipping switch.
Than you Alanp for the advice and guidance
Sent from my iPhone using Tapatalk
Sent from my iPhone using Tapatalk
Title: Re: Greenbean - question on Volume
Post by: Vivek_rc on April 14, 2020, 02:34:55 AM
Post by: Vivek_rc on April 14, 2020, 02:34:55 AM
Thanks Jimilee, I know what you mean about being over confident, it looked all fine via a visual inspection but you never know what's going on under the solder...thanks for the advice Mate. Now to box it. 
Sent from my iPhone using Tapatalk
Sent from my iPhone using Tapatalk