EHX - LPB-1 Nano series

sinner · Post by **sinner** » 27 Jan 2012, 17:49

My bud asked me how to mod new production LPB-1 to Screaming Bird spec.

He send me this image of the board:

The thing I've noticed is that the number of components is almost tripled.

I've searched here and in the interwebz for schemo of one, and nothing pop up, so with the help of the picts from this tread viewtopic.php?f=19&t=1772&p=179238#p179238 I came out with schematic attached. I think it's right (few component is odd compared to good old LPB), but what cranks me big time is those fucking ferrite things... What it is and what function does it serve in this circuit? I've omitted this, and two 100pF ceramic caps, as they also have unclear function in this to me.

Who'll give a hand with this one?

SenQ

sinner · Post by **sinner** » 27 Jan 2012, 18:03

Correction, three 100p's

...Honestly, I don't know where this small (C4) fucker is going to

sinner · Post by **sinner** » 27 Jan 2012, 18:04

I see, out to ground

Nocentelli · Post by **Nocentelli** » 27 Jan 2012, 18:18

RF protection. Those nano enclosures aren't well shielded, so the ferrite beads and caps are to minise the french radio station broadcasting through your amp. I'm pretty sure there's an AMZ blog post about it... It seems these extra components are permanently in the signal path so there was some debate as to whether it could actually be classed as "true bypass" (TM or no TM)

sinner · Post by **sinner** » 27 Jan 2012, 18:23

So what it is? Is that an inductors or what?

pz · Post by pz » 27 Jan 2012, 18:39

http://en.wikipedia.org/wiki/Ferrite_bead

JustinFun · Post by **JustinFun** » 27 Jan 2012, 19:10

Has your friend ever played a screamIng bird? I found mine to be unusable until I changed the in and out caps to 10nf. You might want to try this 'middle ground' between lpb and screaming bird to see what (s)he makes of it.

Guess it depends on your amp and guitar though; I play a rickenbacker which does not seem to be a good match for ehx's extreme treble booster.

Sorry, this is a bit OT re the original post about the extra components on the new lpb...

sinner · Post by **sinner** » 27 Jan 2012, 19:14

This is my bud's entry into DIY really. He have LPB-1 that he doesn't use (I think) and he want to try his abilities to mod it for fun

Here's the final schemo, I've omitted this ferrite thing

JustinFun · Post by **JustinFun** » 27 Jan 2012, 19:45

Fair enough. He might also want to try clipping diodes to ground on the output for an Electra distortion ( or lovepedal Englishman!)ish vibe.

sinner · Post by **sinner** » 27 Jan 2012, 19:47

JustinFun wrote:Fair enough. He might also want to try clipping diodes to ground on the output for an Electra distortion ( or lovepedal Englishman!)ish vibe.

Thanks, I'll link this tread to him

Sikor · Post by **Sikor** » 28 Feb 2012, 14:00

sinner wrote:
JustinFun wrote:Fair enough. He might also want to try clipping diodes to ground on the output for an Electra distortion ( or lovepedal Englishman!)ish vibe.
Thanks, I'll link this tread to him

I found it! Thanks

Now I just need to find a time to do something to my LPB-1

cctsim · Post by **cctsim** » 06 Mar 2012, 22:04

The protection diode D1 in the schematic should be pointing the opposite way.

drewl · Post by **drewl** » 08 Mar 2012, 16:31

I have one of the original Birds.
Looks like the new ones have some power supply protection, an LED and the aforementioned RF snubbers.

I bumped up the input cap value on mine so it makes a nice full frquency boost.
I also built one with clipping diodes, kinda' like the Muff Fuzz.

Dr Tony Balls · Post by **Dr Tony Balls** » 08 Mar 2012, 16:54

Nocentelli wrote: to minise the french radio station broadcasting through your amp

you know till now i never thought about what kind of radio interference youd encounter in other countries! Here is the states it always seems to be some form of Latino station. In Texas it is 100% always Tejano!

Duckman · Post by **Duckman** » 08 Mar 2012, 17:24

sinner wrote:This is my bud's entry into DIY really. He have LPB-1 that he doesn't use (I think) and he want to try his abilities to mod it for fun

Here's the final schemo, I've omitted this ferrite thing

cctsim is right. Check you diode orientation.
Sinner, please, just a favor: can you point me where the ferrites are? Thanks!

sinner · Post by **sinner** » 08 Mar 2012, 18:26

Thanks for correction. Updated schemo attached.

I'm not sure where ferrites was/should be. If I knew it, I forgot by now

muzique.com says it's in signal patch even when the pedal is switched off.

Maybe Sikor, who still owns is could do some additional picts? I'll ask him on FB today

sinner · Post by **sinner** » 08 Mar 2012, 18:28

Doh! Now with schemo

Duckman · Post by **Duckman** » 08 Mar 2012, 21:52

... the ferrites and capacitors could still be used on the pedal to block the RF if the design has placed them on the input of the circuit board instead of before the footswitch. In this case, the circuit would be true bypass when the switch was toggled off but the EMI/RF protection would come into play when LPB was turned on.

Another clue

sinner · Post by **sinner** » 08 Mar 2012, 21:54

I messaged Robert on FB, I'm sure he will do the picts to show what's up. He's great bloke

Sikor · Post by **Sikor** » 15 Mar 2012, 08:37

Sorry guys for the delay, but I have finally found some time yesterday and disemboweled the podal

It was harder than I thought. First the knob was only pushed on,
but pretty hard to lift (at the verge of breaking it).
Second, it was pretty hard to take out the PCB, because of the shape:
this "leg" was pushed very tightly between box and footswitch.
Ofc the option was to unscrew the footswitch too,
but I have managed without it

I'm not virgin anymore

Here are photos:

EHX - LPB-1 Nano series [schematic]