for those that built the easyvibe using rg's layout

[Marcos - Munky]

I need the voltage of the ICs. I built it this week, and it don't work. the signal is clean, bias leds are always on, lfo leds are always off and trimpot, pots and switch does nothing. I checked the lfo leds orientation and they are correct. I tested the leds too, and they are working. What it could be?

[Marcos - Munky]

Anybody :?:  :?:  :?:

[RDV]

I don't have the voltages, but I know that layout is so tight that I had to do a lot of separating traces with a razor knife. There's a good chance that some of them are fused.

RDV

[jrc4558]

Exactly! It's compact design aloows for trace fusions, given the DIY pcb and all that. I had, as RDV says, the same problem.

[MartyMart]

I got one from torchy, he had a spare and it needed some "tidying up"
also make sure that your "bias" LED's are exactly the same make/type !!
I had two slightly different types at first and it was not working, also
make sure no light can get into the LED/LDR connections, I had to cover
mine in black thin foam, otherwise it wasn't "vibing" at all.... !
Also which ic's did you use ? TL062's or TL072's

Marty.

[Marcos - Munky]

I believe that the bias leds are the same type. They are always on, and the other leds are always off, so I think the problem in in my lfo. I checked the traces, and I didn't found any fused traces, but I will check them again. I used 072s.

[RDV]

Check diode & cap polarity.

RDV

[hansl]

I have built the ring modulator, Frobnicator, and had a similar problem, although the LFO seems to be a bit different.  The solution to my problem was to replace the any red LEDs with 2.3 volts 30 mA ones and adding a silicone rectifying diode to the BIAS LEDs. You don't need a rectifying diode, but that was what I had in my supply. I think an 1N4148 will do, or a 1N914. You have to have a certain BIAS voltage to make the LFO oscillate. The BIAS LEDs should  twinkle at rate set by the frequency pot. This is how I did it:

LED      Si diode      LED

--|>|-------|>|-------|>|---------


You can put the diode anywhere in the chain, I choosed this position because it was the easiest way to add it.

You can also try to put a third LED to the BIAS LEDs in the LFO. It is two in the current setup but try three. I tried three in the Frobnicator, the LFO would oscillate, but the circuit would not work properly, until I replaced the LEDs. However in this case you have the LEDs and LDRs, so it might just be enough to get the LEDs to blink. It might also be enough by adding a diode?

I don't say that this would solve the problem, just see it as a hint, in your troubleshoot.

BR,
Hans

[Hal]

I actually have mine out of box right now.

Tell me if it was the diode thing, or if you still need help.  I could post some stuff later tonight.

[spudulike]

All measurements quiescent (ie no input signal)
Rate & Depth set mid-sweep

All ICs TL062
All LED 3mm Red (same batch)

Battery (Off-load) - 9.22V
Battery (On-load) -  8.71V

D6 anode/LED6 - 0.57V
Bias Rail (LDR Common ie J1) - 3.77V

IC1

1  3.8  
2  3.8
3  0.35
4  0.00
5  3.78
6  3.79
7  3.80
8  8.65

IC2
1  2.65 - 4.41
2  2.98
3  3.78
4  0.00
5  3.76
6  3.78
7  3.78
8  8.65

IC3
1  2.64 - 4.38
2  3.30 - 4.11
3  3.26 - 4.04
4  0.00
5  3.75
6  3.78
7  3.79
8  8.61

IC4
1  1.06 - 7.35
2  3.71
3  2.44 - 4.98
4  0.00
5  3.76
6  3.76
7  3.76
8  8.57

[Marcos - Munky]

Thanks for all the suggestions. The diode and cap orientations are correct. I'm a little busy with the college now, but I will have a free time in 2 or 3 days, so I will try to make the diode thing and get the voltages of everything.

[Marcos - Munky]

Here are my voltages:

Battery: 8.96V

ICs (from left to right):

IC1
1  4.19  
2  4.19
3  1.06
4  0.00
5  2.76
6  4.19
7  4.19
8  8.96

IC2
1  2.34 - 5.39
2  2.92
3  4.20
4  0.00
5  3.24
6  4.18
7  4.18
8  8.95

IC3
1  4.19 - oscillates
2  4.19 - oscillates
3  4.13 - oscillates
4  0.00
5  2.42
6  4.18
7  4.19
8  8.96

IC4
1  8.26 - oscillates
2  4.18
3  2.24 - 5.98
4  0.00
5  2.12
6  4.18
7  4.17
8  8.96

The voltages of pins that I wrote oscillates after the voltage are the max. voltage in the oscillation. I didn't got the minimun. Any thoughts?