Hey all,
I'm starting work on a 1969 Boutique Fuzz Face tomorrow, assuming parts arrive. In the vero i have, it works on 2 PNP transistors, but, i have nearly three times the varities of NPN's than i do PNP's. SO, if i wanted to change the circuit to use NPN's instead of PNP's, am i correct in saying that all i have to do is the following:
1. Swap the battery polarity around
- the -ve of the battery will run onto the board (where the +ve originally was) and the +ve of the battery will go to...
2N5089TA transitors. I am attempting to make matched pairs of transistors.
I am using a Cen-Tech cheapo DMM because it has a
NPN and PNP tester on it. When I test these NPNs they measure
at 510-559. The only problem is, what does this number mean???
If I am trying to match up a pair for a Fuzz Face. What number is
best for this. I read the article about the Technology of the Fuzz Face
and the number he give as a sweet spot is based an a tester he built.
The sweet spot if somewhere between...
I'm looking for a part, I can't seem to name it, but I know these exist.
I want to be able to Hot-Swap various 2n styled Silicon Transistors
into a PCB without having to re-solder each piece. I'm looking for
something similar to DIP connector for an IC --- Except it has only
3-pins and will fit an NPN type like the picture below. I know it exists!
I just can't seem to remember name for it's kind or find a link to buy one!
Also, I'd be interested in a similar type of socket that'd either...
I've got some GE transistors, they've got one short leg and two long legs. From some poking around online, I think the short leg is the base. This leaves the other two long legs: is the leg with the little tab adjacent to it the collector or emitter? I found a way to test using a mutlimeter for this but I was wondering if there is a standard, like, short leg=base, tab=emitter or tab=collector etc?
How am I suppose to measure FET's pinch off voltage?. Is this referred as the cutoff voltage(Vds)?..I'm assuming the V+ at the drain while the common(GND) is at the source. Am I right?.. :(
I've spent the last couple of days learning how to use my new breadboard. I've been able to make all but a couple of things work so far. Two of them use BS 170's. I assume that I am reading them off of the schematic wrong.
Could someone show me, or lead me to a labled schematic symbol. Labeling Drain, Source, and Gate.
Why are you posting this here?! This kind of topic should go in the Workbench or How-To section.
I've been using Russian MP13B in Rangemasters with good results - low noise, low leakage, and very consistent. And they're cheap.
In Fuzz Faces, I've done AC128, AC188, and GT308. But it's hard to find good 128/188 anymore... almost all too noisy or leaky. Though, I've built some very nice FF with very leaky 188 before. As long as you get the bias trimmed right, they seem to do their job fine.
hey
i was recently clearing out my room and came across a box of parts from aaaaaaaages ago, when i tried before to make a small amp. Anyway there's a couple of mystery transistors here that i'd love to know what they're used for, the code on them is ZTX500.
i also have a bunch of massive capacitors, like the size of a 2c coin lol. i think they're ceramic disc of some sort. Their code is 104S5. I've also about 400 loose resistors, but the chances of me going through them is mighty slim.
Hello!
I just made a newbies project, a Green Ringer. After plugging it, I saw that there was a little shortcut when I plug the jack. So I removed the problem. But now when I start the effect, the sound is distorded (and I can ear very far the effect). The more stronger I play the guitar the more it distord. Could it be one of the transistor burned? :hmmm: I checked everything, connexion, soldering... But I don't know how to check the transistor (2N5088 x2 and one 2N3906). I read too that...
As I work this out now I use the formula: Av = 0.54 * (Vcc/|Vp| - 2), where Vcc is supply voltage Vp is the pinch off voltage of the FET and Av is the overall voltage gain..
Takes a lot of measurements!
Are there any other simpler methods that are as accurate?
Can a FET be backwards?
This build of Tillman's calls for a J201. In the schematic by Norcot, which is linked below, the J201 has it's round part facing left - flat is toward R2 resistor.
After building the board, it would decrease volume instead of increase it. So as I was debugging without the scematic in front of me I tried another J201 and then the original backwards. BOOM - works correctly. I would estimate 3db of gain. So now it sits in there with the rounded part facing the R2...
I beg for pardon of my ignorance, but I ask what seems trivial to me.
I'd like to get into pedal building and am ordering a bunch of parts to get me started. I'll be using a bread board (I've never seen the likes of one before) to test out various designs. I see that IC chips have prongs under them. There is also sockets which have prongs under them? Am I right to assume that a ic chip needs to be in a socket?
I have a digital multimeter ans when I measure the voltage forward on some 2N5133 transistors I get measurements like .812 and .820 but I have read that good readings are around 300?
How do I convert the .8xx measurements?
Up until now I have been using sockets for transistors.
I've heard that this could be a problem because they can fall out of the sockets with the right amount of shaking.
So I wanted to ask what the proper way to solder transistors is.
I've heard about using tweezers/pliers to cool the leads, but I didn't understand where I was supposed to put the pliers (I know - silly question).
I would imagine putting them on the component side of the PCB and not on the solder...
Hi all,
I am not sure where to post this so I'll put it here. Modman, please put this where it can be of most help.
I found this while researching capacitor characteristics, written by Bob Pease of National Semiconductor. This answered my questions about why mylar sucks and polypropylene is king...a must read if you're the engineering type.
tonepad project for the phase 90 calls for a 2n4195, which i know is a pnp tranny. could i sub in a 2n3906 with no ill effects? i'm not sure of the role of the pnp transistor in this circuit, so i can't tell.
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