Caesar Chorus (Julia) combining LED's

[Rpschultz13]

Just built a Caesar (Walrus Julia) chorus. Normally this has 2 LED's: on/off and pulse rate. The Pulse LED is the D_LFO in the below schematic. I was hoping to combine these into 1 LED that only pulses when it's ON - and is off (and doesn't pulse) when it's off. I tried, but I couldn't figure it out. Seems simple enough to just connect those circuits together somehow, but they are both tapping off ~9v (give or take). So I think it needs to be on the D_LFO circuit, basically ignoring the LED-R103 circuit. Somehow adding the 3DPT switch into the D_LFO leg. ?

Any help would be appreciated.

As it is now, I use an illuminated LED switch and breakout board from PPCB, basically jumpering the A-K holes on the circuit board. Both LEDR's are sticking up in the picture, messing with values. The A-K on the left is the switch using a 4k7 LEDR, and the A-K on the right is the Pulse using 6k8 LEDR.

I should add I got both LEDs working individually (one pulsed), just couldn’t figure out how to combine them.

 

[jwin615]

Cathode of dlfo to the switch side of r103
Don't populate r103
Edit to add, not sure if this will create a pop when the effect is engaged...

 

[jwin615]

Let me clarify, by switch side of r103 I mean the pad that connects to the switch. No5 the pad closest to it. IDK which pad had continuity

 

[Locrian99]

I have done it by just attaching the lfo led cathode straight to the switch. Just run a wire to it, or the sw pad if youre using a break out board. I have no pop issue.

 

[Stickman393]

Easiest way would be to remove r103 and connect the cathode to the side of r103's pad that goes to the switch.

LED anode goes to the normal spot. Get rid of R103 & the on/off LED. Cathode does not connect to ground at the spot marked as K on the board: just run a wire from the cathode leg of that LED to the right hand side of R103 as pictured.

That'll connect your RATE LED cathode to a switch that will be connected to ground when the effect is on, and to nothing when the effect is off.

Result: LED lights only when on, and flashes with the rate of the chorus.

Alternatively, you could omit the left hand LED, remove R103 & replace with a jumper wire, and wire the cathode of your rate LED to the cathode pad of your On/off LED.

Same difference. Or to the switch as recommended above: I just prefer to utilize the board's connections when I can.

 

[Ale_jellybelly]

Post in thread 'Caesar chorus rate LED'

Jan 26, 2024

Wired the rate led and ground on the correct lugs and now it's working perfectly
Definitely a recommended mod for those annoyed by the always-on rate led

• Ale_jellybelly

• 

I did what @Locrian99 says and It works flawlessly

 

[Rpschultz13]

Thanks for the help. I’m leaving town for a week, I’ll try this when I get back

 

[CA138]

Thanks for the help. I’m leaving town for a week, I’ll try this when I get back

You are brave for trying this mod. Yes, best to leave town and lie low for a while. When you get back, we will have a safehouse ready for you to try it again.

 

[Rpschultz13]

I got it to work. @Stickman393's schematic is correct. I took the Anode tab on the D_FLO and connected it to the LED SW tab. Left the switch LED and LEDR (4k7) open.

Of note, originally I used a 1k for the LEDR (6k8)... I find this works best on the 3DPT LED's. But this doesn't work in this circtuit, it just will have the LED on and not blink. So then I put in a 6k8, which worked. I messed around with putting different values in parallel and settled on 3k3 || 6k8 = 2k2. So somewhere between 2k2 and 1k it stops blinking.

 

[Rpschultz13]

Here's a

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