Pauleo1214
Well-known member
Does anyone know where to splice in the anode and cathode on the circuit to get a rate indicator led? Any help would be greatly appreciated!
Best,
Paul
Best,
Paul
Rate LED on Woodpecker
- Thread starter Pauleo1214
- Start date
Pauleo1214
Well-known member
Thank you Cybercow! Nice to see you on this board!
Pauleo1214
Well-known member
Just a follow up, it does work. You did mean across R9 and Q3, right?
Cybercow
Well-known member
I mean precisely R7 and Q2 according to the PedalPCB Woodpecker schematic. But it seems PedalPCB has changed up their BOM and schematic since I'd built mine. So here's a screenshot of the schematic I used in my older version where R7 and Q2 are referenced. . . . .
Note how the Rate LED has been added to the schematic. It will go in the same topological location on your build.
For the newer version, it would appear that rate LED would go across R6 with the cathode connected to pin #2 of the 2N6027. No need to modify the value of R6.
The Woodpecker can be built with either a PUT (2N6027) or a UJT (2N2646) - providing a couple other adjustments are made and the pinouts between the PUT and UJT are compensated for. The earlier version I have uses the 2N2646 UJT. And it appears that PedalPCB has changed up the schematic & BOM for using the easier to get 2N6027 PUT.
So, you can put a rate LED across R6 with the cathode connected to pin #2 of the 2N6027.
Fishbonetabby
Active member
To be clear for me to do this mod myself I would simply run a jumper from the LED anode to r6 and a jumper from the cathode to pin #2 of the 2n6027?
Texasbluezman
Member
From what I've gathered, yes. This build is in my queue. I'm probably gonna do this mod also, but also add a SPST to turn off the blinking light. I would also like to add, it's probably better to use a diffused LED, as they're not as bright as those water color LEDs. I made that mistake on a Tremulus Lune clone. I had to change the resistor to dim the blinking LED. It would blind you! LOL
Pauleo1214
Well-known member
Just wanted to circle back and confirm it works and thank you! I hate to be a PITA but I have a follow up question; the LED pulses at almost full brightness. Is there a value resistor you recommend between the anode and R6 that might exaggerate the pulsing effect?
B
Feral Feline
Well-known member
I think a resister as you described will just make the pulsing dimmer overall, it won’t aid in contrast in any way to exaggerate the rate.
I could be patently wrong, though, as I think I know more than I actually do.
Congrats on getting it to work — it’s on my todolist.
I could be patently wrong, though, as I think I know more than I actually do.
Congrats on getting it to work — it’s on my todolist.
Cybercow
Well-known member
Yeah, adding a CLR in series with the Rate Indicator LED should do well to diminish the brightness.
itstimtime
Active member
4 years later, but did you get this to work with R6 and pin 2? Did the CLR work too?
Tim
