Yet another compressor, this time an optical one. The specified vactrol is quite expensive and hard to get hold of nowadays but you can roll your own using a LDR with 1M dark resistance and green diffused LED.
I tried building the Demeter on the Tag blog. The circuit seems to insist upon a specific vactrol that I don't have. I tried lots of combinations but never got it right. You might have more luck than I did. Check out the layout on TagboardFX.
I built it on a self etched pcb. But I don't remember, where the layout came from and what vactrol U used. I sold the pedal years ago, but regretted it later.
I think that was the one that Gilmour was using most recently, right? I liked the simplicity of it. I tend to prefer the optical compressors. There are a lot of nice ones.
#Orion Tonehunt: I remembered that you were interested in the Thorpyfx compressor. It looked interesting to me too. Stumbled upon a layout from a sister site today. I haven't gotten a chance to try it yet but I thought you might be interested. https://vero-p2p.blogspot.com/search?q=fat+general
T-t-t-tag it!!! Made my vactrol with a juried engineer gl5516 and after a little trial, I settled on a 5mm blue diffused LED. I like c500k better for the comp. Nice and squishy at high settings, different flavor from a dynacomp. Pretty good for a low part count comp.
Ok...I'm keen to make a working compressor... quick question on the orientation of the LED...which column is plus and minus (sorry - I should probably be able to read the symbol)
Also, Mr tonehunt, what transistors did you use because I see 2n3904 as a mid gain transistor (around 350) and 2n5088 as a high gain transistor (usually around 500 to 600 which I usually substitute for mpsa18) due to difficulty sourcing 2n5088. Any advice is gladly appreciated
Positive leg to top column. I made mine with 3904s from Tayda, but I'm not sure if their hfe. The gl5516 photo resistor I'm using is only 500k dark, so I ordered a batch of gl5528 for the appropriate 1M dark. I'm probably leaving a little action on the table which might be why the c500k was more pleasing.
Thank you Anders. 😊
ReplyDeleteThank you!
ReplyDeletePlease add the Demeter Compulator. I think it's based on the DOD 280, but better
ReplyDeleteI tried building the Demeter on the Tag blog. The circuit seems to insist upon a specific vactrol that I don't have. I tried lots of combinations but never got it right. You might have more luck than I did. Check out the layout on TagboardFX.
DeleteI built it on a self etched pcb. But I don't remember, where the layout came from and what vactrol U used. I sold the pedal years ago, but regretted it later.
DeleteI think that was the one that Gilmour was using most recently, right? I liked the simplicity of it. I tend to prefer the optical compressors. There are a lot of nice ones.
DeleteWe want a Fat General! We want a Fat General! .... c'mon guys feel free to join in ...
ReplyDelete#Orion Tonehunt: I remembered that you were interested in the Thorpyfx compressor. It looked interesting to me too. Stumbled upon a layout from a sister site today. I haven't gotten a chance to try it yet but I thought you might be interested.
Deletehttps://vero-p2p.blogspot.com/search?q=fat+general
Good looking out, Tom! Many thanks. I'll definitely give this a shot!
Delete+100 for the ThorpyFX Fat General!!! Schematic: PedalPCB, General Tso’s Compressor
ReplyDeleteT-t-t-tag it!!! Made my vactrol with a juried engineer gl5516 and after a little trial, I settled on a 5mm blue diffused LED. I like c500k better for the comp. Nice and squishy at high settings, different flavor from a dynacomp. Pretty good for a low part count comp.
ReplyDeleteOk...I'm keen to make a working compressor... quick question on the orientation of the LED...which column is plus and minus (sorry
ReplyDelete- I should probably be able to read the symbol)
Also, Mr tonehunt, what transistors did you use because I see 2n3904 as a mid gain transistor (around 350) and 2n5088 as a high gain transistor (usually around 500 to 600 which I usually substitute for mpsa18) due to difficulty sourcing 2n5088. Any advice is gladly appreciated
https://commons.m.wikimedia.org/wiki/File:LED_symbol.svg
DeletePositive leg to top column. I made mine with 3904s from Tayda, but I'm not sure if their hfe. The gl5516 photo resistor I'm using is only 500k dark, so I ordered a batch of gl5528 for the appropriate 1M dark. I'm probably leaving a little action on the table which might be why the c500k was more pleasing.
DeleteThat's great. Thank you. I have the right ldr from the magnavibe.
ReplyDeleteCheers
Here it is!
ReplyDeletehttps://youtu.be/S3eDC9Bcqtg
Thanks Ian!
DeleteTagged.
Ian, your demo is now uploaded.
Delete😊 thank you Anders
DeleteI built this pedal and I really liked the result
ReplyDeleteLDR 5528 + green diffused LED 5mm.