Rockett 10 Tone Hammer [traced]

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Rockett 10 Tone Hammer [traced]

Postby Manfred » 07 Jun 2017, 23:29

10ToneHammerComponetsSide.jpg


10ToneHammerSolderSide.jpg


It was difficult to trace the PCB, a measurement using an ohmmeter was often necessary.
The PCB got more than two layers.

10ToneHammer.JPG


Rockett10ToneHammerClippingDiodes.jpg
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Re: Rockett 10 Tone Hammer [traced]

Postby mirosol » 12 Jun 2017, 19:06

Guys at the tagboardeffects blog have built this and there is one slight error in the schem. The 10K from bass pot's lug 1 should most likely connect to ground instead of 1/2V. Having it at 1/2V means that the dc voltage will reach recovery FET's gate and this will make the bass pot work iffy. Gavin just moved the resistor to ground and his tonestack now works as intended.
+m

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Manfred (12 Jun 2017, 21:49)
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Re: Rockett 10 Tone Hammer [traced]

Postby Manfred » 12 Jun 2017, 21:49

mirosol wrote:Guys at the tagboardeffects blog have built this and there is one slight error in the schem. The 10K from bass pot's lug 1 should most likely connect to ground instead of 1/2V. Having it at 1/2V means that the dc voltage will reach recovery FET's gate and this will make the bass pot work iffy. Gavin just moved the resistor to ground and his tonestack now works as intended.
+m


Thanks for the hint.
I was very surprised that the 10kOhm resistor is connected to the 1/2V and I rechecked the connection, it was right.
Maybe I'm simply was wrong or the fault came from Rockett, but I have no way of confirming this, because I sold the pedal.
I am annoyed with myself, because I usally read the voltages on the FET's pins, this time I forgot it.
But anyway, the pedal seems to be working well with the resistor connection to the ground.

I attach the corrected schematic:

10ToneHammer_2.JPG
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Re: Rockett 10 Tone Hammer [traced]

Postby Manfred » 16 Jun 2017, 14:44

I checked the FET-stage by circuit simulation.
Sorry, that was my fault regarding the 10 Kiloohms resistor connection to half voltage point.
The resistor must indeed connect to the ground.
If the resistor is conntected to the half voltage point the bias point of the FET-stage is floating depending on Bass pot setting.
BTW, the almost same stage is applied in the Rockett Flex Drive circuit.
The simulation resulted in a value of 5V at the drain.
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Re: Rockett 10 Tone Hammer [traced]

Postby Säröpedaali » 10 Jul 2017, 05:08

Should 1k+100n and 1k+220n to pin 2 to go ground?
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Re: Rockett 10 Tone Hammer [traced]

Postby Manfred » 10 Jul 2017, 08:06

Säröpedaali wrote:Should 1k+100n and 1k+220n to pin 2 to go ground?


It is indeed connected as shown in the schematic.
In the AC equivalent network, the half voltage point is equivalent to the power supply ground.

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Re: Rockett 10 Tone Hammer [traced]

Postby Säröpedaali » 10 Jul 2017, 13:08

Manfred wrote:
Säröpedaali wrote:Should 1k+100n and 1k+220n to pin 2 to go ground?


It is indeed connected as shown in the schematic.
In the AC equivalent network, the half voltage point is equivalent to the power supply ground.


Ok. I build this in breadboard and it's oscillating high pitch like crazy:).
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Re: Rockett 10 Tone Hammer [traced]

Postby alltrax » 10 Jul 2017, 14:17

Check your breadboard I built it and it sounds great
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