|
Post by burtrocket on Sept 27, 2012 6:09:27 GMT -5
Does anybody have any thoughts on how to increase the vibrato depth on the Farfisa Compact models? As far as I can tell, you can adjust the vibrato depth with a variable resistor (potentiometer) rated at 10 K on the vibrato circuit board. I´m no engineer, so I don´t really know if it´s right or wrong to assume that you can increase the vibrato depth simply by replacing the potentiometer with one with higher value? Any thoughts on this? Attachments:
|
|
|
Post by greentamborine on Sept 28, 2012 11:36:10 GMT -5
I can't offer any answers but I sure would like to know the answer!
The Vibrato on my compact deluxe works great, but if it ever goes south I'd like to know my options.
Does your Vibrato work as normal? Or are you looking to modify the vibrato circuit for a more dramatic effect?
|
|
|
Post by burtrocket on Sept 28, 2012 12:48:59 GMT -5
The vibrato on my organ works fine. But yep, it would be fun to modify the vibrato circuit for a more dramatic effect.
|
|
|
Post by joelindsey on Nov 6, 2012 12:04:06 GMT -5
yes, you can. Check out the schematics for the vibrato board, near the output you'll see two resistors set up as a voltage divider that attenuates the vibrato signal. Adjust one of those should help. Also, replace those electrolytic caps. All of them! I've seen the vibrato on several compacts be improved simply be replacing those caps.
|
|
|
Post by burtrocket on Nov 15, 2012 9:33:03 GMT -5
Sounds cool. What´s the name of the two resistors you are refering to? (All the resistors in the schematics have different names, like R 859, R 860 etc.
|
|
|
Post by joelindsey on Nov 19, 2012 20:56:49 GMT -5
try increasing R842 (towards the lower left corner) to something like 10k-20k. You might have to adjust the value of R837 to maintain a good contrast between the High/Low intensity tabs. Again, be sure to replace all those electrolytic caps.
|
|