could please someone post their EA tremelo voltages~?

[nightingale]

i've been trying to get this thing going for a friend~
i built it exactly to specs as shown on the perfboard layout at www.runoffgroove.com

i am getting no voltage reading on my jfet... seems a little funny! i am aware of the jfet legs that need to be twisted and seem to have the pinout correctly...if someone could post their voltages, i think i could figure it out from there... again, this is the one with the mod for the flashing LED...

i am just getting a blatty below unity sound.. nothing else... i know lots of cats have built this circuit here.. maybe someone could give me a heads up..

[gez]

There's no DC bias on the JFET so 0V is right.

Check the pinout of your MOSFET.  Measure the voltage at the drain and adjust the trim til it's between 4.5 - 5V.

Is the LED blinking?  If not then the LFO isn't working.

Is your JFET pinout correct?

[nightingale]

thanks for the quick help Gez~
NO, my led is not flashing.. it is getting a little voltage across it tho.. i will recheck my resistor values..
hmm, i'm pretty confused on this one!

[gez]

NO, my led is not flashing.. it is getting a little voltage across it tho.. i will recheck my resistor values

Post your values for the LFO.  If it's biased correctly and you've got the phase-shift network wired up ok, then you'll probably need to sub in a trannie with higher gain to kickstart oscillation.

[nightingale]

assuming that my jfet: SK9460
has the same pinout that the cross on the NTE site: http://www.nteinc.com/graphics/diag9f.gif

i should be in business.. i have the legs twisted so that the gate is connected to depth lug 2... looking at the SK9460 from the top.. it is shaped like a "D".. with the source and gate twisted so that the gate is at the bottom... is it possible that the NTE site is wrong?
curious,

[nightingale]

not exactly sure which voltages so.. battery: 9.46

mosfet:

D: 4.35
G: 1.87
S: 1.47

LED+ 8.97

2N5088 hfe: 696

[nightingale]

which tranny should i sub~?
the BS170? i'm not clear on this..

[nightingale]

bumping!

[gez]

not exactly sure which voltages so.. battery: 9.46

mosfet:

D: 4.35
G: 1.87
S: 1.47

LED+ 8.97

Q3 would be the trannie that would need to be subbed if its gain isn't high enough.  However, first things first.  The bias looks iffy/I'm confused by your reading.  When you say 8.97V where are you measuring from?  Take measurements from Q3's collector.

[gez]

You've only got a 0.4V difference between gate and source of Q1.  Seems like a pretty low threshold, but stranger things happen at sea...(probably ok)

edit: Are you still getting the blatty sound with the voltages you posted for Q1?  If so then something's up with this trannie.