E.W.S Tri-Logic II Bass Preamp [traced]
- chicago_mike
- Tube Twister
It sounds really good. Even through its simplicity. its very clean and has good output.
The circuit is also used inside active Xotic basses.
The circuit is also used inside active Xotic basses.
Skyline FX 2013
- chicago_mike
- Tube Twister
bluetube wrote:That's one switching option similar to what I had in mind. The photos say otherwise though. Maybe they got it wrong in the factory or I need to get my eyes checked?chicago_mike wrote:signal hits the passive active switch before anything. Its a dpdt. top 2 lugs are one resisitor, bottom 2 are another and the middle lugs are the signal from the jack to the pcb.
just checked a couple piccies.
Input Jack-Whitey wire-3PDT Switchey-Whitey wire-passive agressive Switchey-Whitey wire-PCB
Skyline FX 2013
Hey Mike did you notice anything odd about the P/A switch wiring based on the pix?chicago_mike wrote:bluetube wrote:That's one switching option similar to what I had in mind. The photos say otherwise though. Maybe they got it wrong in the factory or I need to get my eyes checked?chicago_mike wrote:signal hits the passive active switch before anything. Its a dpdt. top 2 lugs are one resisitor, bottom 2 are another and the middle lugs are the signal from the jack to the pcb.
just checked a couple piccies.
Input Jack-Whitey wire-3PDT Switchey-Whitey wire-passive agressive Switchey-Whitey wire-PCB
- chicago_mike
- Tube Twister
I know, middle lugs are unused.
So...Actually its probaly putting a resistor either in parallel with the input to ground resisitor, or in series.?? Wait...NOt the to ground resisitor, but input resistor...had to look at some amps that have active / passive inputs.
I wonder if that DPDT is a criss-cross style switch.....you know...1 and 2 of one side and 2 and 3 of another.....I have a couple of those. I HATE'EM!!!
Skyline FX 2013
Maybe it's a weird kind of DPDT, like the ones you have. If so, like you mentioned, it's switching the 100k resistor parallel to the 1M resistor (shunt to GND before the input cap). Some kind of impedance matching I guess.chicago_mike wrote:
I know, middle lugs are unused.
So...Actually its probaly putting a resistor either in parallel with the input to ground resisitor, or in series.?? Wait...NOt the to ground resisitor, but input resistor...had to look at some amps that have active / passive inputs.
I wonder if that DPDT is a criss-cross style switch.....you know...1 and 2 of one side and 2 and 3 of another.....I have a couple of those. I HATE'EM!!!
Mike do you have pot values? Maybe verify the resistors as well? Both existing and unknown? I'm color blind and the resistors are 1/8w. I probably got some values wrong.
Matt can you join the murder mystery? Help fill in the blanks? Pretty please?
- chicago_mike
- Tube Twister
50K pots
250K for master I think..I wish I still had mine.
I'll get to work on the resistors soon as I get back from my gig.out of state.
250K for master I think..I wish I still had mine.
I'll get to work on the resistors soon as I get back from my gig.out of state.
Skyline FX 2013
- pedalgrinder
- Cap Cooler
am i losing it or is there a schematic for this i can't see i wen't through the lists and looked at the pics and can't even get a parts list together. Are you guys doing or building something here i can't see????????
What's the best thing about fat chicks and scooters? There both fun to ride around until your mates find out!
- Bill_Mountain
- Breadboard Brother
There's a rough draft on page 5.pedalgrinder wrote:am i losing it or is there a schematic for this i can't see i wen't through the lists and looked at the pics and can't even get a parts list together. Are you guys doing or building something here i can't see????????
- chicago_mike
- Tube Twister
I'm gonna go thru the info tonight...finally!!!
Skyline FX 2013
- chicago_mike
- Tube Twister
Uhh..what scale is the pcb at? I dont have mine anymore and want to print the one here. To test a physical proto..
EDIT: Nevermind!
EDIT: Nevermind!
Skyline FX 2013
Mike are you going to build this? Ima send you a PDF version if you're up for it.chicago_mike wrote:Uhh..what scale is the pcb at? I dont have mine anymore and want to print the one here. To test a physical proto..
EDIT: Nevermind!
- chicago_mike
- Tube Twister
Yeah. I have time after my weekend gigs.
Skyline FX 2013
Allo allo! Attached are files for the gizmo in question. UNVERIFIED and INCOMPLETE. P/A switching not shown. I'll leave this part alone. There's a schematic floating around the net for your alternative P/A switching needs. Some part values unknown or unsure (represented with ??? on either the schematic or parts layout).
Suggestions and inputs are always welcome. Edit as necessary. Ready to transfer PCB pattern in PDF (1:1, A4 sized paper) and layout with schematic in JPG.
Suggestions and inputs are always welcome. Edit as necessary. Ready to transfer PCB pattern in PDF (1:1, A4 sized paper) and layout with schematic in JPG.
- Attachments
-
- ews trilogic2 PCB unverified incomplete.pdf
- (20.79 KiB) Downloaded 288 times
- chicago_mike
- Tube Twister
TY!!
I'll check it out after the weekend. I'll be picking up some positive boards for my new uv etcher.
I'll check it out after the weekend. I'll be picking up some positive boards for my new uv etcher.
Skyline FX 2013
- Nikifena
- Solder Soldier
A month ago I get one xotic fretless bas for repair. This bass has the same PCB like this one. Just for fun I trace it.
The schematics is the same. Here is the missing parts based on the last schematics:
The feedback resistor between the gate and drain is 10Meg
The resistor in the opamps feedback wich limit the gain (24k???) is 24k (in series with the 200k trim)
There is no 2k4??? resistor near the middle freq switch. The capacitors for the middle are 100n and 47n
Niki
The schematics is the same. Here is the missing parts based on the last schematics:
The feedback resistor between the gate and drain is 10Meg
The resistor in the opamps feedback wich limit the gain (24k???) is 24k (in series with the 200k trim)
There is no 2k4??? resistor near the middle freq switch. The capacitors for the middle are 100n and 47n
Niki
Thanks Niki. OT, nice looper!Nikifena wrote:A month ago I get one xotic fretless bas for repair. This bass has the same PCB like this one. Just for fun I trace it.
The schematics is the same. Here is the missing parts based on the last schematics:
The feedback resistor between the gate and drain is 10Meg
The resistor in the opamps feedback wich limit the gain (24k???) is 24k (in series with the 200k trim)
There is no 2k4??? resistor near the middle freq switch. The capacitors for the middle are 100n and 47n
Niki