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Messages - soren_jepsen

#1
Preamps and Effects / Re: relay switch
May 01, 2007, 04:15:32 PM
Did consider it, but it would an ugly space where the original switch was  :(

Besides, I would learn a bit   ::)
#2
Preamps and Effects / Re: relay switch
April 30, 2007, 05:43:05 PM
Maybe I should clarify  ::)

I want to put the Noisy Cricket into an old stomp box. It fits nicely, and have the three holes for pots already. However, the old stombox didn't use a mekanicle switch, but some kind of touch switching (it's an old DOD stomp box).

I would like to use that foot switch (which I just called touch switch  :duh) for the grit switch in the Noisy Cricket. Can anyone tell me how to do that?

Here's the link for the Noisy Cricket just for the sake  :)

http://www.beavisaudio.com/Projects/NoisyCricket/DIY/

#3
Preamps and Effects / relay switch
April 30, 2007, 08:53:18 AM
How do I make a digital switch for an fx pedal?

I need to use that instead of a simple toggle switch.
#4
Amplifier Discussion / Re: PSU for lm3886
March 27, 2007, 02:37:28 PM
I was probably not formulating myself too well  :-[


I realize the need for diodes (or a bridge). But those MUR860 are impossible to find i Denmark. Are there any good alternatives? What about bridges?
#5
Amplifier Discussion / PSU for lm3886
March 25, 2007, 06:01:39 PM
What does your psu's look like? I've surfed around the net, looking at different peoples take on this. It seems the amp is quite sensible to this.

BrianGT uses those diodes in his psu, but I can't find them here (Denmark). Can u suggest some good alternatives (also to the circuit)?
#6
Amplifier Discussion / valvestate the lm386
February 23, 2007, 05:48:26 PM
I'm fiddling around with the lm386, seemingly learning a lot  :lmao:

I stumble across this thread about valvestating the lm386 (one of ardrics posts, it has a link) , but i don't really get it. Could anyone explaine?

http://www.diystompboxes.com/smfforum/index.php?topic=45678.msg334715

Thanks  :D
#7
Amplifier Discussion / Re: Questions on Ruby
February 13, 2007, 09:22:09 PM
Thanks, you're awesome man  :D
#8
Amplifier Discussion / Re: Questions on Ruby
February 13, 2007, 05:33:25 PM
#9
Amplifier Discussion / Questions on Ruby
February 08, 2007, 04:22:41 PM
I've been looking at different versions of the lm386 amp. Is it possible to put fx. a fender or marshal tonestack in there, without loosing the nice overdrive u can get with the circuit? The Noisy cricket does have a single knob, but I would like more flexibility.

ROG have a version where they use the fetzer circuit, but if I'm correct that is higher gain than the circuit in the ruby and noisy cricket. How does that affect the sound?

Could you fx. put the tonemender from ROG in between the buffer and the lm386?

Hmmm... I guess this shows quite a lack of gain knowledge on my side :-[

...on that note, how do you calculate the gain loss of a tonestack? Could it be done in either Tina Pro or ltspice?


#10
Amplifier Discussion / Re: What is this ic?
November 04, 2006, 04:08:53 PM
Thanks for the answers  :). I have tried the gainclones, and I love the simplicity. Should tweaking more, but a lot of people write about their experience and testing and (imortant) listening. Listening to the ones I've build I belive I can relate to these experiences. I've build mibe them from scrap pieces, so quality is so and so. However I build an amlifier:
http://sound.westhost.com/project27.htm
...witch sounds much more "relaxed" when playing the guitar thru it. This is why I'm seeking elsewhere :-)
In regards to tube amplifiers I've looked at the ax84 project, and find it interresting. However, as you write Bob, it's dangerous voltage if you don't know what you're doing. Besides, finding output transformers in northen Europe seems dificult.

for the tecnical part:
Anyone know how the before mentioned power amp should be bias'd (SVR1)
#11
Amplifier Discussion / Re: What is this ic?
October 31, 2006, 03:43:48 PM
hmm, not even sure I'm using the correct terms. Talk about trashing around in my ignorance  :-[

The ic5 pussled me, because i thought it to be a buffer (not too sure about what this is in detail  :-[). I looked at the datasheet for a TL072 and it did kind of make sense to me, but then i compared the diagram with the ic's of the preamp, and I got confused.

Guess my knowledge in electronics is very simple theory fusioned with trial by ....smoke. Fortunately Very little smoke has issued so far, but then agin my theory is likewise limited.

By the way, I think a guitarist once showed off his Dean Markley to me. He's a profesional, who played in the danish band "Led Zepelin Jam".

Anyway, and I'll stop babling soon, are there any pitfalls in trying to build the poweramp of the k-150?

/Soren
#12
Amplifier Discussion / Re: What is this ic?
October 31, 2006, 02:09:14 PM
I was kind of browsing thru the schematics, to see what they were made of. People seem to like these amps (?). I've been messing (pretty precise word in my case ;-)) around with building a guitar amp. I've already build a bass amp using this preamp:
http://www.albertkreuzer.com/preamp.htm
and this poweramp:
http://sound.westhost.com/project27.htm

Also I've build an inverted lm1876 amp using scrap pieces and a lm3886 for a guitar amp.

I'm messing around with different preamps for the guitar. The K-150 seems reasonably simple to put together, and i have a pair of the mosfets laying(?) around :-)

...and I'm also aware that I know very little of electrnics and may be out on a limb  xP  ...but I'm having fun  :loco

Anyway (I'll stop soon) I thought about a Tl072 for the ic, but the pinout had me pussled.


/Soren
#13
Amplifier Discussion / What is this ic?
October 30, 2006, 05:28:25 PM
Question from newbie (with a big N)  :D

I'm looking at the poweramp part of the Dean Markley k-150:
http://deanmarkley.com/Info/LegacyAmps/Schematics/D1509.pdf

- What kind of ic is ic5?
- what does it do, is it a buffer ?  ???

/Soren