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Post by frets on Dec 19, 2019 17:26:51 GMT -5
Hey Guys, this post has two purposes. The foremost is to show me where I went wrong on the electrical engineering attempt in the post; as well as, show a double sided tone pot with a really good Lo Fi Blues Mod. Think razored speaker with a nice sustain ring. Hope the picture turns out.
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Post by newey on Dec 20, 2019 8:29:20 GMT -5
Sorry, frets, but I moved this post out of Tone Controls since it is more of a question thread. If the completed design holds up after being vetted, you can then move it back to Tone Controls as a finished design.
First of all, with respect to your wiring diagram, I can't tell how the transistors are meant to be wired.
Is your question how to make a schematic out of the symbols you have?
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Post by thetragichero on Dec 20, 2019 9:48:44 GMT -5
needs more horizontal lines in the schematic (a good chunk of the components are not connected). seems to be a similar problem in the pictoral layout but i read schematics a lot easier. wires are your friends appears that the mosfets are being used as clipping diodes (no power source or biasing resistors). not certain how that will work in a passive circuit. we've experimented with low Vf schottky diodes for passive clipping and a believe the result was underwhelming so will it be "lo fi" as the name suggests? if it works will it be a useful sound? I'm skeptical
edit: schematic symbol is for a fet but looking up the transistor results in an npn dd3 m transistor (bjt). easier for our purposes because we can expect a 0.6Vf on the internal diodes my guess for the partial schematic up there: unless you've got ridiculously high output pickups this will create an effective noise gate (too effective - any signal from the pickup will be shunted to ground)
edit 2: dj9 seems to be a family of zener diodes? weird. I'm all for using salvaged components (obscured stuff not made anymore) but you can be sure I'll test with standard 2n5088/2n5087 transistors and use them in the schematic unless it doesn't work/doesn't sound as good.
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Post by frets on Dec 20, 2019 10:23:52 GMT -5
Newey and Trag, I can’t find a software program that is stupid simple that draws wires or lines. This was done in DIYL that does not offer the selection of “lines” for drawings. If you have some recommendations.
As far as the circuit goes, those are silicon transistors and the DJ9 is an old Russian Germanium Diode. When the transistors are placed together symmetrically with the middle legs cut, the diode between the transistor legs and the capacitor in parallel, I can assure you it’s quite the passive effect. A different sounding clipping that pulsates. A ringing distortion that sounds Lo Fi.
In addition to the underwhelming, I recently put up a passive diode array that is amazing in terms of clipping and clamping. It would surprise you as to its overdriven sound. It is 8 diodes and “overwhelming” I would be glad to make you one to test out. I am going to record it when I find my Guitar Rig.
So guys, where to go next with the software, I’d like a drag and drop that had the ability to draw lines for wires, etc. I’ve been reading the primer I think Trag sent me and desperately want to learn to draw. I’m a Statistician and not and Engineer. It’s baby steps.
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Post by thetragichero on Dec 20, 2019 10:38:56 GMT -5
I'm no good at software drawing so i use a pen and paper and just scan it. sometimes i feel fancy and use a ruler
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Post by newey on Dec 20, 2019 13:52:22 GMT -5
This still doesn't tell me where the other legs are connected, and they don't appear to be connected to anything in the diagram.
There are any number of free schematic drawing programs available, some are open-source and others are free versions of subscription software.
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Post by frets on Dec 20, 2019 13:57:58 GMT -5
I’m gonna go with Trag’s recommendation and start trying to draw them freehand. I tried some of the free source software like TinyCad and the components were named rather than pictured. The cross reference did not go well. Freehand works for me.
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Post by thetragichero on Dec 20, 2019 14:46:30 GMT -5
just remember to use the proper symbol for a bjt transistor. I'm pretty sure the ones you used from diylc are a p-channel and n-channel mosfet
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Post by Deleted on Dec 21, 2019 16:00:11 GMT -5
EasyEDAand looking at that, I dont know what you are doing with the Transistors (2SC945 is a NPN) guessing that BLACK was to ground as its shown to the case of the pot
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Post by frets on Dec 21, 2019 19:29:23 GMT -5
Angel, thank you - this is helpful. I just haven’t got around to draw it. The transistors face each other symmetrically. Their legs are twisted together. The DJ9 diode is Parallel to the transistors(between the transistors legs). The transistor/ diode combination is parallel to the transistors/diode. Legs of cap twisted around each leg of the transistors.
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Post by frets on Dec 21, 2019 19:30:29 GMT -5
Parallel to the capacitor - sorry
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Post by thetragichero on Dec 21, 2019 20:16:33 GMT -5
a picture works much better than words when describing a circuit segment
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Post by Deleted on Dec 22, 2019 2:42:15 GMT -5
i did see some thing like that used on a Bass Circuit one time. i think the guy called it a Fuzz Effect
been a long time since i worked with Transistors (like LOG switches that you pass about 0.6v and it turns the switch inside on Fully, that is 0.59v can turn it on a bit like resistance or opening a gate for water to flow out)
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Post by frets on Dec 22, 2019 13:00:38 GMT -5
AngeIsbunny, The second diagram to the right is accurate.
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Post by thetragichero on Dec 22, 2019 13:10:30 GMT -5
except the arrow indicating the emitter is pointed the wrong way for your npn transistors. understand that you're just using a diode inside the transistor but polarity matters for an npn transistor you may use base to emitter or base to collector as your diode. when I'm using a transistor (bjt or fet) as a clipping diode i prefer to clip off the unused leg so that it's less confusing when i go to install
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Post by Deleted on Dec 22, 2019 13:27:54 GMT -5
except the arrow indicating the emitter is pointed the wrong way for your npn transistors. understand that you're just using a diode inside the transistor but polarity matters for an npn transistor you may use base to emitter or base to collector as your diode. when I'm using a transistor (bjt or fet) as a clipping diode i prefer to clip off the unused leg so that it's less confusing when i go to install i hope your not like that with Spiders
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Post by thetragichero on Dec 22, 2019 15:06:57 GMT -5
can't decide whether that would be more it less cruel than soldering them to perf and mounting in a closed aluminum box
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