Suhr Reactive Load [schematic]
- floris
- Cap Cooler
I see two problems in this build, if I see it correctly:
1) Why is there a connection between the 68 Ohm resistor and one side of the output transformer? The output transformer needs to be connected to earth there. The 68 Ohm resistor (parallel to the 0.6mH coil and the 22nF cap) should not be connected to earth.
2) Why is the other side of the output transformer connected to the 47k Ohm resistor? The 10k Ohm line out volume pot needs to be connected in between so it forms a voltage divider with the 47k Ohm resistor.
Where will you put the capacitor(s) (3x 80uF in parallel = 240uF) that go parallel to the big 6mH inductance?
Are the power resistors mounted off board on a heat sink?
thanks friend,the number 1 is an error I'll fix it as soon , the 47k is also wrong .
yes the power resistors are on the heatsink and the capacitors will go in their place when they arrive. THANKS for the corrections I will post photos during the next phase of the work.
yes the power resistors are on the heatsink and the capacitors will go in their place when they arrive. THANKS for the corrections I will post photos during the next phase of the work.
- floris
- Cap Cooler
Yes the 47k is in series with the 10k pot. But the WIPER of the 10k pot needs to be connected to the output transformer. The 47k resistor should not be directly connected to the output transformer. Please check again because it looks like it is not connected correctly.
edit: Oh it looks like you see this problem...
edit: Oh it looks like you see this problem...
Guys, I wanna try and build a very simple reactive load box based on this Suhr design, I edited the schematic traced by soulsonic, omitted everything that I won't be needing and I just need someone with more experience than me to confirm that I did not go too far with it
Also I will be replacing the big 7 Ohm power resistors with 8 Ohm values, since I have them from a previous project (a simple dummy load box). Is this of any concern?
Please!
Also I will be replacing the big 7 Ohm power resistors with 8 Ohm values, since I have them from a previous project (a simple dummy load box). Is this of any concern?
Please!
- floris
- Cap Cooler
You need the Line Out! But you can leave out the balanced output if your have a DI box or some sort of transformer isolator, unless ground loops are not a problem for you.
The 8 Ohm resistors will be fine.
The 8 Ohm resistors will be fine.
- Optical
- Breadboard Brother
The mark III output isnt isolated (just a divider on the output), so you might have ground loop issues.
But you can add the line transformer isolator easily to resolve
I also have a Mark II (green stripe), great amps
But you can add the line transformer isolator easily to resolve
I also have a Mark II (green stripe), great amps
- soulsonic
- Old Solderhand
Information
Be sure to use a big heatsink so you don't need a fan!
"Analog electronics in music is dead. Analog effects pedal design is a dead art." - Fran