JHS Pulp-n-Peel [traced]
- roseblood11
- Tube Twister
Thanx for sharing!
To retrace it, pictures of both sides of the pcb are needed, and it would be great if you could post all the parts values and mark the pot connections on the pcb.
To retrace it, pictures of both sides of the pcb are needed, and it would be great if you could post all the parts values and mark the pot connections on the pcb.
- Dirk_Hendrik
- Old Solderhand
Information
- Ice-9
- Degoop Doctor
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That is a horrible soldering job on the wiring.
It's fairly straight forward, if you want to start it , press start. You can work out the rest of the controls for yourself !
No silicon heaven ? preposterous ! Where would all the calculators go ?
No silicon heaven ? preposterous ! Where would all the calculators go ?
Dear all,
This post is tagged as traced but i cannot found any schematic.
So, since Pulp n' Peel is just an Orange Squeezer with some cool mods, i just modified O.S like Josh did.
The main mods are the blend control and the Comp control.
See bellow: I tested this circuit and it works so good!
If you have some doubt, feel free to ask me!
This post is tagged as traced but i cannot found any schematic.
So, since Pulp n' Peel is just an Orange Squeezer with some cool mods, i just modified O.S like Josh did.
The main mods are the blend control and the Comp control.
See bellow: I tested this circuit and it works so good!
If you have some doubt, feel free to ask me!
- Lithium_Grim
- Breadboard Brother
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Did Josh really just leave the second opamp in the TL072 totally opened??? Not 7 connecting to 6 and 5 to 1/2 V?
I only give negativ feedback and y'all love it!
PCB shop
PCB shop
- Intripped
- Cap Cooler
How do you say that?Lithium_Grim wrote: ↑07 Nov 2021, 12:39 Did Josh really just leave the second opamp in the TL072 totally opened??? Not 7 connecting to 6 and 5 to 1/2 V?
I mean, are you sure about it?
- Lithium_Grim
- Breadboard Brother
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I am reffering to the schematic. It says TL072, but only shows 1 op-amp in use. It has 2 op-amps and the second one should be properly "stubbed" to prevent possible noise. See the TI technotes which has a reference design for that. They advise to connect the output (pin 7) to the inverting input (pin 6) and the non inverting input (pin 5) to 1/2 Vin (not ground!)
I only give negativ feedback and y'all love it!
PCB shop
PCB shop
Hi dear all,
Once I did not used the second op amp, I think I can leave it disconnect.
I don’t use the ref voltage (4,5v) in any part of this circuit.
But you can do that in order to reduce possible noise… I don’t have this issue leaving it disconnected.
The mods I refer that Josh did is about blend control and comp control.
Cheers
Once I did not used the second op amp, I think I can leave it disconnect.
I don’t use the ref voltage (4,5v) in any part of this circuit.
But you can do that in order to reduce possible noise… I don’t have this issue leaving it disconnected.
The mods I refer that Josh did is about blend control and comp control.
Cheers
- Intripped
- Cap Cooler
...ok, now i get your point.Lithium_Grim wrote: ↑08 Nov 2021, 07:01I am reffering to the schematic. It says TL072, but only shows 1 op-amp in use. It has 2 op-amps and the second one should be properly "stubbed" to prevent possible noise. See the TI technotes which has a reference design for that. They advise to connect the output (pin 7) to the inverting input (pin 6) and the non inverting input (pin 5) to 1/2 Vin (not ground!)
yes, unused opamp pins should be properly terminated, i agree with you!
you had better follow LG's advice
- Lithium_Grim
- Breadboard Brother
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Option 2: Use a TL071, just need to rewire the output that is pin 1 in the schematic to pin 6 (output on TL071/ single op-amp) and pin 8 Vcc on the TL072 to pin 7 Vcc on the TL071
I only give negativ feedback and y'all love it!
PCB shop
PCB shop
- cspar
- Breadboard Brother
Looking at the board the Pulp N Peel might have the other side of the op amp snubbed with the two 10K resistors (R9 and R10) as the voltage divider.
But there is also the extra transistor, 6? 10K resistors (if R7 is 10K) and the fact that it has a buffered bypass.
So it also might be that the always on buffer is the transistor with the other side of the op amp being used for summoning and buffering the mixed signals.
Either way would be functional.
We need to see the other side of the board to really know.
But there is also the extra transistor, 6? 10K resistors (if R7 is 10K) and the fact that it has a buffered bypass.
So it also might be that the always on buffer is the transistor with the other side of the op amp being used for summoning and buffering the mixed signals.
Either way would be functional.
We need to see the other side of the board to really know.
"Just because the forgoing circuits have produced results there is no reason experimenting won't lead to added results." L. E. Darling, in his article containing the earliest published vacuum tube synthesizer circuit, Popular Science Jan 1920
Dear all,
Last week i studied more this circuit... with this gutshot... In conclusion, this version is basically an Buffer n' blend + Standard Orange Squeezer + Little black Buffer (switch)
I traced below the schematic:
My plan is to build this schematic on next week, tracing it in Eagle cad.
I will update after test it.
Cheers
Last week i studied more this circuit... with this gutshot... In conclusion, this version is basically an Buffer n' blend + Standard Orange Squeezer + Little black Buffer (switch)
I traced below the schematic:
My plan is to build this schematic on next week, tracing it in Eagle cad.
I will update after test it.
Cheers
- Reachahighernoon
- Breadboard Brother
That "Comp" control looks oddly a lot like the attack control on the orange smoothiegiubacon wrote: ↑13 Nov 2021, 23:30 Dear all,
Last week i studied more this circuit... with this gutshot...
Pulp top.jpg
In conclusion, this version is basically an Buffer n' blend + Standard Orange Squeezer + Little black Buffer (switch)
I traced below the schematic:
pulp.jpg
My plan is to build this schematic on next week, tracing it in Eagle cad.
I will update after test it.
Cheers