Messages

Thanks guys!

The 2nd problem - if it's ok on the LED side, but not working on the other side, there must be a problem with the mosfet clipping.

I'd check your connections around the 2N7000's and the 1N34A - check there are no shorts etc, and consider swapping them out in case they are faulty....

Ian

Thanks midwayfair - I knew you'd know/chip in when diodes were mentioned! :-)

PS: They are sold as "10PCS GERMANIUM DIODE 1N34A DO-7 new", so am I right in saying that they are neither Germanium nor DO-7?

Here is a photo:
http://goo.gl/r0oPz

Thanks,

Ian

Ah, ok - should they not have a different model number if they are a completely different diode?!?

Ian

I've recently bought a few batches of 1N34A's on eBay, and most of them when they arrived look more like 1N4148's (small and orange) rather than big glass and see through like 1N34A's.

(I believe from some Googling they are DO-35 package instead of DO-7?)

What's the score with those? - are they fakes and not really 1N34A's? - or are there different versions?

Do they work/sound the same?

I've not measured the forward voltage of them yet - i'll have to do that.

Thanks,

Ian

I'll check through everything - thanks.

Ian

Ahh, of course - Current Limiting Resistor!

Ok, thanks for that.

Ian

CLR?

The LED resistor you mean?

Ah, ok.

Any idea what the difference was in ver.5?

Ah, cool - interested to hear your experiences.

According to the board, it's ver.4 - but actually if you look at Serendipity_ver.5.pdf, the single sided board layout still has ver.4 on.

Wonder what the difference between ver.4 and ver.5 are? - maybe it was only a mistake on the fabbed one?

Ian

Yeah, valid point - it just didn't seem to have as much level as I thought it should, so I was wondering if there was anything I could do to narrow down the problem...

Thanks,

Ian

Thanks - anyone any idea why it doesn't work with a 4558?

I tried about 4x different JRC4558's and had the same problem on them all.

I then put in an NE5532 and it seems to work fine.

Voltages with the NE5532 in:

Supply: 9.19v

1: 4.52v
2: 4.49v
3: 4.25v
4: 0.1mV
5: 4.47v
6: 4.50v
7: 4.50v
8: 9.19v

I'd say it sounds more "gritty" than "serene" though.....

Ian

Ah, cool - thanks.

I'm testing it with a JRC4558 as i've got an AD712 on order but it hasn't arrived yet.

The others i've used from the batch (of 100) have been fine, but i've got plenty so i'll try another tonight.

Ian