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Messages - Vivek_rc

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1
General Questions / Re: Collosalus Flanger 500k Reverse Log
« on: April 25, 2020, 02:59:13 PM »
https://freestompboxes.org/viewtopic.php?f=28&t=22623&p=279580#p279580

Scroll down, someone posted this for 2 different units
Hi

thanks for the information, this is very useful. My next build is the Dandy Horse echoflanger, the measurements on the site are very helpful. I think After that Iíll retire from building anymore flangers!

Thanks again for your help

2
General Questions / Collosalus Flanger 500k Reverse Log
« on: April 25, 2020, 05:32:28 AM »
You can also jumper a 100k resistor across legs 2 and 3 of a B500K pot. Check out this link:
http://www.geofex.com/article_folders/potsecrets/potscret.htm
Hey Bio77, I went with the G500k, and the pedal is working now, I have calibrated it and getting a flange. Will need to find tune it a bit more.

I actually biased my current lover based on one of your post where you mentioned the frequencies, it was very helpful.

Did you also have a record of the frequencyís expected when biasing the collosaluls? Would be very helpful to fine tune.

Thanks


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3
General Questions / Re: Collosalus Flanger 500k Reverse Log
« on: April 21, 2020, 11:09:01 PM »
Hi Danfrank,

Thank you for the advice, I manage to get a 9mm G500K on eBay which is suppose to be a C500K, but the turns are sort of staggered to 40 turns, will test this on the board and see if it works. Have also ordered a 16mm C500K if the G500K doesnít work out,

Thanks again for your advice

Vman


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4
General Questions / Collosalus Flanger 500k Reverse Log
« on: April 21, 2020, 02:27:34 AM »
Hi All,

Need some advice on the Madbean Collosalus Flanger, i am finding it difficult to source a 9mm 500K reverse log Pot for the Sweep, and was wondering if a 9mm 500K linear pot could be used as a substitute.

Alternatively i was thinking of getting a 16mm C500K as an alternative with a small compromise on the aesthetics of the build :)

Appreciate any advice and guidance on this, thanks

Vman

5
General Questions / Re: Greenbean - question on Volume
« on: April 13, 2020, 08:34:55 PM »
Thanks Jimilee, I know what you mean about being over confident, it looked all fine via a visual inspection but you never know whatís going on under the solder...thanks for the advice Mate. Now to box it.


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6
General Questions / Greenbean - question on Volume
« on: April 13, 2020, 05:55:04 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


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7
General Questions / Re: Greenbean - question on Volume
« on: April 13, 2020, 02:25:02 PM »
Check all your other parts and reflowed yet?


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Will try to do a reflow


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8
General Questions / Re: Greenbean - question on Volume
« on: April 13, 2020, 02:24:16 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.
Hi 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 


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9
General Questions / Greenbean - question on Volume
« on: April 13, 2020, 05:00:35 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 itís still the same, volume is still at the same level.

10
General Questions / Greenbean - question on Volume
« on: April 13, 2020, 03:17:57 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, itís not much louder even setting volume pot at max, the controls work and drive pot does overdrive the signal, clipping also changes the sound. Iíve measured all the voltages and everything checks out. Was hoping to get some advice if anyone has faced a similar situation.

Many thanks

Vivek




11
General Questions / Re: Rump Roast Query
« on: March 26, 2020, 04:05:21 AM »
Adding Photo of the build, thanks again

12
General Questions / Rump Roast Query
« on: March 26, 2020, 03:33:32 AM »
Hi All
Iíve just completed a Rump Roast Build (bought in around 2010  but forgot/misplaced it and then it appeared again a month ago in a toolbox!). I do get an output, a misted boost and tone control works, Iíve built it as a hybrid, switchable between a boost and overdrive. I am not getting a significant boost, itís On a similar level as the clean signal. Also when I bias to 4.5 V I get no sound, Iíve played with both trimmers and when I set Q1:1.3V and Q2:1.5V I then get an output. Any help and guidance would be greatly
appreciated, thank you -

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