Hi

I was wondering where to buy NKT23 transistors.

That will be cool if you can point me toward the right direction.
I don't want to pay a fortune for untested transistors...

Thx

I'm pretty sure there's a reason that there's different values of hFE for different species of transistors, from power transistors to small signal, and for families of resistors within each species, such as 2n2222 variants and such.

Is the intention to design with specific voltages and currents in mind, and then use the highest gain transistor within a family of transistors that have the general volt/current/frequency behaviors you want?

if you build a circuit for a specific function, do you...

I've been attempting to add an expression pedal output to adjust the modulation rate of a BBE Mindbender (true vibrato/chorus).I used a switched TRS jack socket between the board and the pot, and unshielded cable. The rate pot is situated at the opposite end of the pedal to the new socket, so the wiring runs the length of the board, and back.

Everything works OK when the pedal is in a disassembled state, with the new jack and wiring stetched out away from the board, but when packed into the...

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Hehe... didja think it was a flying V? Well this ones got a lot of things wrong but I wanted to post a before picture.
May change the scale, electrics are trashed, missing a few bits, lacquer is cracking... Time for disassembly and a mild stripping. Still dreaming of mods for my J.Mascis but it plays fine and I've wanted one of these bodies for a while...

I claim no success here, but I did stumble upon a Japanese kindred spirit with some great photos on his blog.

Happen to have a pair? I'm in the U.S.

enjoy

We're running a competition to win an OWL programmable effects pedal. You can enter by writing an effect...

foto 3(4).JPG

I have Korg MS-20 I need to get rid of... Used to belong to a friend who owed me money.
Shoot me a message if you're interested...

Hi guys,

Just wanna share a nice project I've just finished . it's a tremolo with duty cycle variation . The lfo isn't really mine it's a modified Ray Wilson's LFO . I changed few values to make it better for a tremolo project.

few words about it . I replaced the tradditional square wave by a kind of soft square made of an op-amp. It avoids ticking noise . I added a x2 gain stage at the end to allow a volume pot . (that way no complains about the volume drop) . this stage is not really...

I'm trying to unload these PCBs cheap!

This is preamp part of Hiwatt The Who CP-103 replica layout

Download high resolution PDF file here

My layout visually is based on the picture of real The Who that I've downloaded long time ago from (I think) Mark Huss website ( The schematic is also an direct redraw from there. I would thank you Mark for all Hiwatt resources he did, massive job well done

My layout is for preamp board part only. The PA and PS is stock to DR-103 100W AFAIK

Comments, corrections and discussion much welcome...

This may be of interest to anyone wanting to get into the world of programming PIC Micros. Often used in MIDI projects etc.

Consists of:

PICkit™1 FLASH Starter Kit (£49 in maplin)

Maplin PIC 16C84 Progammer Kit

5 books to get you started.

Matrix Multimedia PICmicro Microcontroller Development BoardV2.2

9 x PIC16F84 Microcontrollers

6 x PIC16F877 Microcontrollers

Milford Instruments 2 x 16Alpha Numeric Display With BPK driverBoard

Also includes early versions of PicBasic Pro,...

I have the following for sale:

5 x ALPS RSAON11M9 Motorised Faders, New, Never Used

Sensible offers please

$(KGrHqZ,!rIFG,bz!vV7BRn20nzMfw~~60_58.jpg

...actually called the simple square wave shaper made simpler :

Escobedo Squarewave shaper_vero nocentelli.gif

Hi, my name is Kirk and I bought the YCV50 about Three years ago. I changed the older valves for some EL34JJ's and ecc83JJ's and it worked great with no problems for about Two years until the other day. I was playing it at rehearsal so we couldn't be too loud, then it started making a banging noise and now gives me no more than a whisper with a hint of distortion. There is no sensitivity whatsoever and striking a chord gives a bit of a jump in volume but then decays rapidly! I have resoldered...

Looking for one or two of Madbeans Pepper Spray pcb. Either his original fabricated boards or if you have a self etch I'll buy that as well.

Let me know, thanks!

so i downloaded the schematics and breadboarded the Supreaux from ROG. got to work biasing the jfets to read 4.5v at the drain as stated on the schem. first two came out perfect, but the third is too high. at the highest it reads 8.98 and the lowest 7.31. the others go from 8.98 all the way down to 0.20.
ive swapped the trim pots around and tested all of them (all 100k), dismantled and rebuilt the thing twice before giving up and trying the Prof Tweed...
same problem...
has anyone else...

For anyone interested, I have a bunch of calculator web pages I saved to my hard drive.
I zipped them up and put them on dropbox for anyone who may be interested...
Its a 6+ Meg file, HTML and images etc.
The pages are from various sites.

Hey, also newbe here..
I've done quite a few diy pedals so far, but drives and distortion only, this is why I'm asking for help.
A frind of mine just gave me a danelectro cool cat which has problem with the speed knop. Either min or max the pot doesn't affect the tone.
I measured some strange values on the tl072, but replacing it didn't fix the problem.
Does anyone have a clue?...or at least a schematic..
Thanx

Ibenaz ST-9 Super Tube Clone For Sale:

I have an amazing Ibanez ST-9 clone with quite a few extras for sale. You can view the information with pictures on ebay at this link:
or just go to ebay and type in Ibanez ST-9. If you have ever been looking for one of these this one is amazing and with out the $400 price tag. PM me if you are interested $120 plus shipping. Thank you

'

Hi guys,

I'm restoring a vintage Boss pedal.

I'm looking for the screw that closes the footswitch / battery compartment . And the big spring that works for the footswitch mechanism.

They are missing in my pedal and I need to replace them.

If you have an unused or gutted pedal you can part out, just let me know.

I recently stumbled upon a video on YouTube where a gentleman modded and switched the housing adding a fourth knob that manipulates the trim pot inside and of course switching the button over to a raised singular EHX style button,Can anyone help me attempt this or tell me the materials I would need I am new at this and I figure this would be a good place to start.I already know what size housing i need and I plan on doing the drilling myself.

thank's!

here is the video!

Not sure if this is the proper place on the forum...but was hoping to get some technical insight. I am wanting to add the predelay section form the Ghost Echo to the Tenebrion reverb. See links with schematics below. looking at the Tenebrion schematic, Obviously the pt2399 will slide in right after c2 (cut trace to ic1 and leave trace to R11,) but I am not sure if any modifications should be made coming out of the pt2399 (pin 14, c3 r8 r9 on ghost schematic) and going back into IC1 on...

Hi All!
First post in your awesome forum.
I have just completed a Brass Master from General Guitar Gadgets, and when i plugged it in for a test i just made all kinds of awful noises and very loud oscillations, that change with the filter buttons.

Does anyone have any idea what this could be caused by?
This is my first build, and troubleshooting is quite daunting.

Thanks in advance
Sauber