sr1200 said:if i recall this is discussed in the calibration procedure no?
Correct.Diamondj421 said:I believe recalibrating the unity gain pots only affects the signal when the compressor is engaged. Correct?
So the reason of your 3dB R/L level difference is not the SB4000, because the hardwire bypass simply connects input with output.This is happening engaged and bypassed.
so the fault is connected to the +12VDC/-12VDC supply rails, causing a current draw exceeding parts rating (FI by one or more short/s or broken part/s).Sinkia said:... But when I do connect the two PCBs, r182 and 183 (10ohm) start to smokes..
Harpo said:so the fault is connected to the +12VDC/-12VDC supply rails, causing a current draw exceeding parts rating (FI by one or more short/s or broken part/s).
Double check for correct part and part orientation of U9, U10 (sidechain VCAs), U13 (TL072) and U15, U16 (TL074).
If any of these chips have been placed reversed with the unit powered on, at least these reverse powered parts will be broken.
The multipin connectors J6 and J18 are placed with correct orientation ?
Hi,ruckus328 said:Adjust DTRIM Pots (VR3/VR4 on Main Board) for lowest THD. Then turn front panel gain knob to Max (lower the input signal as required so signal doesn't clip). Now adjust the 50K Pots on the VCA boards for lowest THD. Return front panel gain knob to 0. You will need to repeat this process a few times until lowest THD is achieved.
Blahpstick said:Does anybody still have a copy of the schematic PDF for this? Unfortunately the old DropBox link is dead.
For the regular DIY haunts on here:
I built two of these bad boys with the quad VCA's and they have both been working great for me. I had built one for LR (fantastic choice) and one for drums, but the quad VCA version just doesn't have enough attitude and smickety-smack for my taste on that rock drum buss.
Now I've only used the quad VCA's before, but would I be able to get that higher THD dirt if I convert one of my builds to the single THAT (or DBX can) VCA version?
Thanks for your time, ladies and gents!
buildafriend said:Its a current limiting resistor. Google that, how many mA do you want to the LED? How many VDC are going to it? Sounds like you might already have 2 parts of a three part formula.
I'm building an SB-4000 using the 8027-B 1mA meter from Hairball. Can someone confirm that I need to adjust R133 to 275R-300R (from 1K) for the lamp with this meter? The Hairball link from where this advice was originally given is dead, so I want to confirm and get it right the first time . Also, any advice on an exact value to use with this meter would be great.
jcgriggs said:More questions:
Power for the Livingnote Crush'n'Blend board, is that J19? If so, what is the pin out? If not, where are the connections for this? I can see the points for RD, RW, RO, LD, LW and LO on the PCB, just not V+, V- and ground (0).
I am not planning to implement the external side chain and I believe that would allow me to re-purpose the Ext In switch as the Crush'n'Blend bypass switch - is there any problem doing this? My understanding is that leaving the Ext In switch unconnected will just disable the external side chain but I wanted to confirm this.
Blackdawg said:I don't know your answers per say..however a volt meter will tell you if its the case with J19 pretty quickly.
As for the switch, just unplug it and test it out to see what happens!