Janglebox [traced]
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Either way should work fine, although as a variable resistor it make more sense. As a voltage divider, it would be better to have a resistor between the pin and ground.
I can amend my layout to include both options.
I can amend my layout to include both options.
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Here's a revision that allows you to connect the Sustain pot either way via one jumper. It could be a useful mod...it might give a different feel. Dunno.
- pedalgrinder
- Cap Cooler
absolutely sensational once again madbean i swear your blood is worth bottling. i got to admit adding a treble booster is the go cause it picks up what most compressor's seem to drop depending on which one of course. But a nice tone control after a a compressor can really make the best of everything.
What's the best thing about fat chicks and scooters? There both fun to ride around until your mates find out!
- plesur
- Degoop Doctor
Here's my layout. It is verified.
Here's the schematic: A couple of changes in this version of the schematic, the pots in the previous version were reversed and I've now added a drop down resistor at the output (R9) that was present in the original Ric compressor.
Here's the parts list:
Recommended mods:
Change R23 to 10K for more volume at output, the original value, 92k, gave slightly less than unity gain at full volume.
This layout has been designed with Wimas caps in mind, so you can use those huge 2u2 Wimas MKS2 63V
Also, the trimpot is a precision 20 turn one like this:
http://www.taydaelectronics.com/potenti ... 3296w.html
Enjoy.
Drill sizes are 0.9mm for components and 1.3mm for the pots.Here's the schematic: A couple of changes in this version of the schematic, the pots in the previous version were reversed and I've now added a drop down resistor at the output (R9) that was present in the original Ric compressor.
Here's the parts list:
Code: Select all
C1 22u
C2 22n
C3 10n
C4 10n
C5 10n
C6 470p
C7 2u2
C8 2u2
C9 2u2
C10 2u2
C11 2u2
D3 1N4001
D4 1N4148
D5 1N4148
IC CA3080E or NTE996
Q1 2N5088 or 2N5089
Q2 2N5088 or 2N5089
Q3 2N5088 or 2N5089
Q4 2N5088 or 2N5089
Q5 2N5088 or 2N5089
R1 1M
R2 10k
R3 1M
R4 10k
R5 1M
R6 8k2
R7 1M
R8 1M
R9 10k
R14 10k
R15 10M
R16 1M
R17 1M
R18 1M
R19 10k
R20 220k
R21 10M
R22 10k
R23 92k
R24 68k
R25 33k
R26 33k
SUSTAIN 250k LIN
LEVEL 250k LIN
SW1 ON-OFF-ON
TRIM 1k
Change R23 to 10K for more volume at output, the original value, 92k, gave slightly less than unity gain at full volume.
This layout has been designed with Wimas caps in mind, so you can use those huge 2u2 Wimas MKS2 63V
Also, the trimpot is a precision 20 turn one like this:
http://www.taydaelectronics.com/potenti ... 3296w.html
Enjoy.
- telecaster
- Resistor Ronker
What program are you guys using for these layouts. They look very good.
KindaFuzzy - Looks like a blue nail polish and nutella sandwich.
Freekish - "Our originality is in the basement. Our business is in the toilet"
Guitarlcarl - I did take offence at being called an idiot by a moron.
Freekish - "Our originality is in the basement. Our business is in the toilet"
Guitarlcarl - I did take offence at being called an idiot by a moron.
- ShortScaleMike
- Resistor Ronker
Information
Has anyone had any success with the Vero in this thread? (I'm using the one with the modifications to unground Sustain lug 1)
I have the trim set up with 500 ohms either side so the CA3080E I'm using (Harris) should be set up OK, however I'm getting no sound at all with any setting of the Volume and Sustain knobs, and if I pull Q5 to remove the feedback loop I get some sound, but it's horribly distorted and cuts out.
Does anyone have some good voltages for the transistors and op-amp? Do I need to use an NTE996 for this? They're £8 here and it would be ordered from the US so that would take a while...
I've tried multiple CA3080Es and 2n5088s and 2n3904s with no change I'm afraid. I'm not very familar with compressor circuits, where should I start to look for what's wrong?
I have the trim set up with 500 ohms either side so the CA3080E I'm using (Harris) should be set up OK, however I'm getting no sound at all with any setting of the Volume and Sustain knobs, and if I pull Q5 to remove the feedback loop I get some sound, but it's horribly distorted and cuts out.
Does anyone have some good voltages for the transistors and op-amp? Do I need to use an NTE996 for this? They're £8 here and it would be ordered from the US so that would take a while...
I've tried multiple CA3080Es and 2n5088s and 2n3904s with no change I'm afraid. I'm not very familar with compressor circuits, where should I start to look for what's wrong?
- plesur
- Degoop Doctor
The NTE996 should be equivalent to a CA3080E. It is just what was used in the original unit. I used a CA3080E in my build with no problems.ShortScaleMike wrote:Does anyone have some good voltages for the transistors and op-amp? Do I need to use an NTE996 for this? They're £8 here and it would be ordered from the US so that would take a while...
I'll get back to you later with some voltages from my build.
- ShortScaleMike
- Resistor Ronker
Information
Thanks that would be ace. This one has me really stumped. I've checked over the veroboard layout and it seems fine compared to the schematic, and equally I can't see anything wrong with my build after staring at it for a while. Some voltages would really help.plesur wrote:The NTE996 should be equivalent to a CA3080E. It is just what was used in the original unit. I used a CA3080E in my build with no problems.ShortScaleMike wrote:Does anyone have some good voltages for the transistors and op-amp? Do I need to use an NTE996 for this? They're £8 here and it would be ordered from the US so that would take a while...
I'll get back to you later with some voltages from my build.
- plesur
- Degoop Doctor
OK, Here we go. Battery reads 9.3V. Readings taken with Sustain and Volume on full, test signal running.plesur wrote: I'll get back to you later with some voltages from my build.
IC:
1 No connection
2 2.3V
3 2.3V
4 0
5 0.6V
6 2.3V
7 9.3V
8 No connection
Transistors (C B E)
Q1: 9.3V 1.4V 2.0V
Q2: 8.8V 2.3V 2.4V
Q3: 1.3V 60mV 0
Q4: 1.3V 60mV 0
Q5: 9.3V 0 1.3V
Without the test signal:
Q1: 9.3V 1.4V 2.0V
Q2: 8.8V 0.8V 0.4V
Q3: 4.5V 0 0
Q4: 4.5V 0 0
Q5: 9.3V 4.5V 8.2V
Hope this helps you get yours up and running.
- mictester
- Old Solderhand
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R16 (1M) looks much too big to me - the original had 150k with a 10µ for the capacitor to ground (rather than 2µ2 as here). This will give rather more current into the buffer transistor base - that transistor may not be conducting enough to control pin 5 on the 3080.ShortScaleMike wrote:Thanks that would be ace. This one has me really stumped. I've checked over the veroboard layout and it seems fine compared to the schematic, and equally I can't see anything wrong with my build after staring at it for a while. Some voltages would really help.plesur wrote:The NTE996 should be equivalent to a CA3080E. It is just what was used in the original unit. I used a CA3080E in my build with no problems.ShortScaleMike wrote:Does anyone have some good voltages for the transistors and op-amp? Do I need to use an NTE996 for this? They're £8 here and it would be ordered from the US so that would take a while...
I'll get back to you later with some voltages from my build.
"Why is it humming?" "Because it doesn't know the words!"
- plesur
- Degoop Doctor
Although the Dynacomp has 150k, both the Janglebox and the Rickenbacker compressor have 1M at that point.mictester wrote:R16 (1M) looks much too big to me - the original had 150k with a 10µ for the capacitor to ground (rather than 2µ2 as here). This will give rather more current into the buffer transistor base - that transistor may not be conducting enough to control pin 5 on the 3080.
- ShortScaleMike
- Resistor Ronker
Information
Thanks very much, you're a star - and cheers mictester, I'll also have a play with R16 if I have no luck!plesur wrote:OK, Here we go. Battery reads 9.3V. Readings taken with Sustain and Volume on full, test signal running.plesur wrote: I'll get back to you later with some voltages from my build.
IC:
1 No connection
2 2.3V
3 2.3V
4 0
5 0.6V
6 2.3V
7 9.3V
8 No connection
Transistors (C B E)
Q1: 9.3V 1.4V 2.0V
Q2: 8.8V 2.3V 2.4V
Q3: 1.3V 60mV 0
Q4: 1.3V 60mV 0
Q5: 9.3V 0 1.3V
Without the test signal:
Q1: 9.3V 1.4V 2.0V
Q2: 8.8V 0.8V 0.4V
Q3: 4.5V 0 0
Q4: 4.5V 0 0
Q5: 9.3V 4.5V 8.2V
Hope this helps you get yours up and running.
I completed the build and the Janglebox sounds great. A friend also did a build and asked me about the trim pot. Both of us find that it has no effect. The voltage at pin 3 of the IC remains pretty much constant. In looking at the schematic I am not at all surprised by this.
What am I missing about the trimpot?
Here is the link to the schematic posted by plesur:
https://www.freestompboxes.org/download/ ... p?id=16595
What am I missing about the trimpot?
Here is the link to the schematic posted by plesur:
https://www.freestompboxes.org/download/ ... p?id=16595
- plesur
- Degoop Doctor
The trimpot is quite subtle. There is a small sweet spot where you get the best 'thump' at the start of each note. Tweak it until you find the place that sounds the best to you, adjusting it while playing.Kazooman wrote: What am I missing about the trimpot?