what are this..
on the image
Diodes.
Probably used for clipping?
here are some pics.. really need a help..
They both look like zener diodes for clipping of the inverted signal. Perhaps this is just soft clipping and not hard clipping of the wave form... Here are a couple pics for reference.
thanks a lot sir.. :)
Can you please post the circuit/schematic, or link to it? It would be more informative than the layout.
here it is sir
These are clipping diodes. The schematic has a note about what they are.
You can google for "diode clipping guitar" which gives you a ton of articles on what they are and options e.g. types of diodes to use.
I have bookmarked articles such as the following:
http://krooshof.home.xs4all.nl/instrumenten/fuzzing.html
http://www.diystompboxes.com/cnews/mods.html
so thus this mean,putting this diodes running on the lm781 replaces the mpf102 on the schema from the original noisy and improved its gain? am i right? :)
If you are trying to replace the MPF102 on the Noisy Cricket, use the whole 741 op-amp section of the schematic.
The point of the op-amp in the schematic is to create some grit/distortion/overdrive.
I don't think gain with the LM386 is a problem. If you look at the Smokey Amp design, it didn't even have a pre-amp stage.
For my first DIY guitar amp, I used an overdrive pedal (Joyo Vintage) feeding into a TDA7052A audio amp kit. I didn't bother to use a pre-amp stage since (a) the TDA7052A has enough gain to deal with guitar-level signals and (b) the overdrive pedal took care of the "sounding like a guitar amp" feature...
if i follow that,will i be able get the same result as the noisy cricket claimed to be ran at a 4x12 cabinet?
i just want want an amp that has a volume control and a tmb knobs,coz i have a zoom multi effects and can ran into a 4x12 cab,. and specially its non complex and simple as the noisy cricket to built?
This is a great little find! Well done! :dbtu:
This is great starting point to get going and easily improve/expand in stages. <3)
Strongly advise you build pre and main amps on different assemblies, PCB, stripboard, bare matrix, tagstrip, birdsnest, whatever; input to the pot, alone, to the main amp (power with main).
Use good quality IC sockets - you will be changing stuff.
The clipping diodes limit the output by turning the op-amp into a a Voltage Follower, its gain reduced from the small signal value - it's an amplitude limiter.
{IN} goes to the non-nverting input of the op-amp and is effectively a very hi-Z input, similar to a FET, and with the TL07x-series it actually is a FET.
Google some basic op-amp theory.
I think it would be at its best into a big cab like that, more cone area the better, but that "Output Volume" pot is very optional. You can stick it in later if you feel the need, but there still seams to be heaps of control.
I love this circuit as an exploration tool! <3)
{pre/clipper/gain1}-{volume}-{power/gain2}-{spkr}
{pre/clipper/gain1}-{TMB-EQ}-{volume}-{power/gain2}-{spkr}
Should work. :dbtu:
@roly
thanks!.. it seems that i found his enclosure was so cool, and explored it accidentally finding out this type of circuit,, :lmao: i noticed i didnt see a FET on it,perhaps i see another chip..
now i'm starting to understand the concept a bit.. is it like this?? input sound--pre-amp(optional) or used pedals as pre-amps---op amps (with optional preamps)-- speaker/ output??
{pre/clipper/gain1}-{volume}-{power/gain2}-{spkr}
{pre/clipper/gain1}-{TMB-EQ}-{volume}-{power/gain2}-{spkr} <--- just this thing in here i didn't understand (the pre/clipper/gain1) and (power/gain2)
whats pre? and gain1? and gain2? :loco
sorry.. still learning..heheh
@bluesky6
thanks :tu:
@roly
im just wondering if i can do this? would this work??
(see attachment)
(http://browndogsroadieschool.com/wordpress/wp-content/uploads/2012/02/roadies.jpg)
(http://www.everyjoe.com/files/2007/10/roadie4.jpg)
http://youtu.be/V5P1Vkzel4k (http://youtu.be/V5P1Vkzel4k)
Some other ways (could mod for op-amps);
Conventional Fender tonestack;
(http://i1341.photobucket.com/albums/o743/Roly49/Solid%20State%20Guitar%20Amps/FETPreamp121003_zpsc44f4831.gif) (http://s1341.photobucket.com/user/Roly49/media/Solid%20State%20Guitar%20Amps/FETPreamp121003_zpsc44f4831.gif.html)
My quasi-parametric;
(http://i1341.photobucket.com/albums/o743/Roly49/Solid%20State%20Guitar%20Amps/FETPreamp130522_zpsed803c67.gif) (http://s1341.photobucket.com/user/Roly49/media/Solid%20State%20Guitar%20Amps/FETPreamp130522_zpsed803c67.gif.html)
etc...
Quote from: nikkram17 on April 27, 2014, 01:04:52 PM
i just want want an amp that has a volume control and a tmb knobs,coz i have a zoom multi effects and can ran into a 4x12 cab,. and specially its non complex and simple as the noisy cricket to built?
Your set up is similar to what I started off with, except that I had a Joyo American Sound to do the tone control.
Why don't you use the Tonemender circuit (http://www.runoffgroove.com/tonemender.html) for TMB, then a plain Smokey Amp circuit for the power amp?
Or you may be able to skip the second op-amp in the Tonemender circuit if the LM386 has enough gain.
@roly
your some kind of a guitar tech?? is that a roadie means?? a sort of like that??
you had a link to a U2 concert, don't tell me that your one of that personnel who setup that successful concert?? or just a fan of U2
@bluesky6
sort of like that schema.. heheh
I like U2 too, but didn't know it was their crew; just a shot of a typical big show crew/roadies doing what they do.
"Roadie" short for Road Manager ('tho what you "manage" is road cases full of equipment, and moody musicians/actors). Actual role is to move in and set up all the gear needed for a show, then strike and bomp out after the show. Sometimes that can be very considerable, many truckloads for big shows.
I've worked shows in many capacities, roadie, lighting operator, Fx, soundie/mixer/recordist, theater tech/electrician, stage-manager, show promoter, blah etc, and amp/guitar tech.
Playing in a band is something like 50% "furniture removal", "the lug", carrying the gear out of storage into the truck, drive to gig, unload gear, "bomp in", and set up.
Performance. (I have a rule, I'm playing a show, or I'm working a show, but I don't do both).
Tear down, "bomp out", lug, pack, drive, unpack, lug in. 2am and time for some R&R - Rest and Recreation.
I think JMF has had more experience with big arena shows. I've done some biggies, but mainly theaters, pubs, halls, small/medium venues.
{be careful of redcircits and runoffgrove, several of their circuits have problems.}
Quote from: Roly on April 29, 2014, 10:26:19 AM
{be careful of redcircits and runoffgrove, several of their circuits have problems.}
Ah yes. The 80-20 rule of any "free" intellectual property: they get you 80% of the way there and you have to spend your own blood sweat tears and knowhow to complete the rest of the 20%. Speaking as a veteran of the open source software world.
It will be great if you can highlight dubious circuits you know of. Some of the runoffgroove stuff look very interesting but I would be severely challenged if I had to debug any one of them.
Just do a search here on those two names and I'm sure you will quickly get the idea, e.g.;
http://www.ssguitar.com/index.php?topic=2995.msg22357#msg22357
thanks guys.. i noticed it that their circuits are suspicious,some of it are redundant and makes me confused reading it..ahaha.,
@roly
is their any radio devices where i can salvage some jfet's?? coz im already excited to test my 1st build but i can;t continue bcoz im still waiting for the jfets uv send.. im stuck on their., heheeh..
Protip: most of the time it's you, but sometimes it really is them. ;)
In the days of electronics magazines occasionally a circuit would be published that could not possibly work. I could give you dozens of examples.
The InterWeb badly needs a very large garbage collection, of stuff on sites, and whole sites, that only subtract from the sum of human knowledge - and who nobody predicted, the rise of the wet-behind-the-ears know-nothing instant "expert", the troll, the blackhats working with real Mobsters; NSA/CIA/FBI/5eyes/Marketing Big Data, not the Web we thought we'd get.
(http://www.ekantipur.com/uploads/tkp/news/2010/gallery_08_30/Page-3-GARBAGE-COLLECTED01_20100831092321.jpg)
What I do is remove the internal boards of old radios, amps, whatever turns up by the roadside/tip/dumpmaster bins/etc., and they go in a big box for parts scrounging. A few VCR front panel boards give me enough red signal LED's I'll ever need, etc. All sorts of self-contained SMPS modules. A lot of later stuff is SMD if your eyesight is good.
Take lots of stuff apart, see how it goes together and how they come apart, what's inside and where. Getting stuff open is half the game.
@roly
i havent yet recieved the fet's uv send our post office here in our town really sucks,. they said,ill recieve it in a month or two,.haha,.
really sucks,.
"A month or two"? I thought "three to ten days" wasn't impressive, but a month or two implies that there is a couple of months worth of mail backed up somewhere. I once did an installation of a machine in a city mail exchange and they were putting through several tonnes of mail a *day*, so I'd have to assume that there are *hundreds* of tonnes of mail backed up somewhere in your postal system! How frustrating, sorry to hear, hope you get lucky soon.
yah! that's really the situation on our postal system.. really sucks,.so frustrating.. its because they dont have enough mailman to deliver it on time.. :(