Gravitation Reverb Schematic?

[Nolen213]

I order the Gravitation Reverb pedal, but so far no build instructions or schematic was posted. I was hoping to order parts soon, but can't find anything to tell me what is in the circuit. Even the EQD schematic could get me started. Thanks for any help,

 

[Robert]

R1	1M
R2	10K
R3	1M
R4	39K
R5	10K
R6	22K
R7	100K
R8	22K
R9	39K
R10	10K
R11	470R
R12	100K
R13	10K
R14	10K
R15	1K
R16	15K
R101	47K
R102	47K
C1	100n
C2	1u Film
C3	1u Film
C4	10n
C5	1n
C6	1u Electrolytic
C7	1n
C8	1u Electrolytic
C9	1u Electrolytic
C10	100p
C11	1u Electrolytic
C12	100n
C13	100n
C14	100u
C15	100u
C16	100n
C17	100n
C100	100u
C101	10u
D100	1N5817
IC1	TL072
IC2	TL072
IC3	BTDR-3H
IC4	L78L05
ATMOSPHERE	B50K
MIX	B10K
DECAY	B25K
TONE	B25K
LENGTH	SPDT ON/ON

 

[fig]

Coordinates for the new death star...yes, yes!

 

[Nolen213]

Thank You!!!

 

[Robusto]

Is the LM78L05 voltage regulator compatible? I can't seem to find any L7805CV in a TO-92. I compared both datasheets, but I am still unsure.

 

[Robert]

Yes, the PCB was updated for L78L05 / LM78L05.

You can still use L7805CV but the pinout is reversed.

 

[Robusto]

Also, is R11 supposed to be 4k7? I just noticed there isn’t anything here that looks like LED protection. I finished this pedal yesterday and it works great, but the LED died a split second after it engaged.

 

[Kroars]

Also, is R11 supposed to be 4k7? I just noticed there isn’t anything here that looks like LED protection. I finished this pedal yesterday and it works great, but the LED died a split second after it engaged.

Glad you posted this question. I just tested mine before boxing it up and it does the same thing. When active the led indicator “blinks” once and turns off. Hope we get an answer to this soon.

Following the trace on the board it looks like anode of the LED goes straight to the 1n5817 then to V+. Was the LEDR forgotten on this board?

Edit: I think it may have been forgotten, I soldered a 4k7 resistor to the anode of the LED and it works perfectly now. I’ll start a thread in case anyone else has an issue.

 

[Robert]

No LEDR in Gravitation?

I was just about to box up the Gravitation pcb when I happened to notice Robusto’s question about an apparent lack of an LEDR. It was mentioned that the LED indicator seemed to blink for a second and then turn off when pedal was activated. I double checked on mine and sure enough, same thing...

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