Show Posts

This section allows you to view all posts made by this member. Note that you can only see posts made in areas you currently have access to.


Messages - joecool85

Pages: [1] 2 3 ... 147
1
Schematics and Layouts / Re: 5th Gear Overdrive v3.0
« on: Today at 08:20:02 AM »
Thanks for posting that. Looks cool, might try it.

Which diode is the LED and which is the 4148?

Can two general purpose NPN transistors be configured as the darlington, or does the sound depend on the characteristics of that particular transistor?

Phil in gorgeous Young Harris, Georgia, USA

It doesn't matter which diode is which as long as you have them facing opposing directions.  I haven't built it with general NPNs as a darlington, but others have on diystompboxes, and it seems that it works fine.  That said, I had another person build it and try a bunch of trannies and couldn't get the exact same sound as MPSA13 with anything else - close enough to work, but not quite the same.  Take that for what it's worth!

2
Way Huge has debuted a new pedal with an existing circuit inside.  The Chalky Box is actually a Saucy Box, but with chalkboard paint on it.  Sounds silly, but this is actually pretty neat!  I think I would considering finishing a DIY pedal this way.  Not 100% sure I'd spend $119 on this one from a store, but I rarely buy pedals and if you are one who does, this isn't out of line price-wise with anything else on the market.  Check it out!

https://www.guitarplayer.com/gear/way-huge-debuts-new-chalkboard-paint-covered-chalky-box-pedal

3
I see the biggest advantages of nutube vs low voltage regular tubes being: less weight, less space, less cost (sometimes anyway).  Also longer life span @ 30,000 hours of use!  Most regular tubes are rated at 5,000 - 10,000 hours from what I've read.  Mechanically nutubes should take a beating better as well (being dropped, banged around etc).
Sound wise, verdict is out, but many folks seem to feel that it cuts the mustard.
Maybe I should test one of the nutube amps or pedals.
But I really want to build an amp or preamp in the style KMG did.
Is KMG still active at this forum?

It's been a few years since his last login. Send him a PM or email, you might get a response.

4
I forgot to mention I used some modelling amps before, a few of them I'm still using (Peavey Vypyr, Line 6), but I think it's not the real thing.
The nutube approach I think, will not be not the same as real tubes because lower gain per stage and lower anode voltage. You could also use one normal tube with lets say 50-60V anode voltage. Gain will be lower then automatically. So I do not see much advantage for the nutube beside power dissipation and dimensions (volume).

I see the biggest advantages of nutube vs low voltage regular tubes being: less weight, less space, less cost (sometimes anyway).  Also longer life span @ 30,000 hours of use!  Most regular tubes are rated at 5,000 - 10,000 hours from what I've read.  Mechanically nutubes should take a beating better as well (being dropped, banged around etc).

Sound wise, verdict is out, but many folks seem to feel that it cuts the mustard.

5
Amplifier Discussion / Re: Customized Kustom 12 Gauge
« on: March 24, 2020, 11:05:16 AM »
First of all, welcome aboard SSGuitar!

Second, I'd like to put in the first speaker vote.  Eminence Legend 1275.  8|

6
I'd be thinking along the lines of a nutube type amp with class-d power amp.  Vox has it's MV series and they sound pretty amazing.  Digital amps also have come a long way, though I've yet to play one that fully "clicked" with me.

Vox Nutube gear: https://voxamps.com/type/nutube/

7
Schematics and Layouts / Simple guitar cable tester
« on: March 23, 2020, 02:46:49 PM »
This is a super easy to build cable tester circuit with low parts count.  I built mine with junk I had in my drawers.  (Note the  crappy quality stereo jacks being used as mono jacks since I don't want them in anything with sound going through them lol).

Here is where I found the circuit: https://www.diystompboxes.com/smfforum/index.php?topic=92973.0

Changes: I chose to omit the speaker.  I also did it as positive ground (and flipped the LED connections accordingly) because I had an all metal dc jack I wanted to use and rigged it up for standard "pedal power" where the shield is positive.  Lastly, I used 3mm LEDs and a 1k resistor instead of the listed 330 ohm.

No lights on means the cable is electrically open.  Just the red LED on means there is a short.  Both lights means you are in business!

8
Amplifier Discussion / Re: Marshall Mosfet Grounding Issue
« on: March 23, 2020, 09:10:50 AM »
Look at the underside of the circuit board for anywhere a board mounting screw stud is supposed to make contact with a ground trace.

This is my guess as well.  I actually added a ground strap (wire with terminal connection on it) so that I have a better ground connection to chassis.  The stud to PCB method works most of the time.  Key word, "most."

9
Schematics and Layouts / 5th Gear Overdrive v3.0
« on: March 19, 2020, 02:47:30 PM »
I've had some time recently and have made some adjustments to the 5th Gear Overdrive I designed in college (https://www.ssguitar.com/index.php?topic=11).  This is pretty fantastic now.  No more noise when adjusting gain level, awesome clean when rolled all the way down.  Using my telecaster with regular Fender single coils it has a great edge of breakup sound around 10 o'clock, coming into solid rock and roll territory around 2 o'clock, then full on screamer at full gain.  Not quite metal gain, but honestly, getting close.

Try it, you might just love it!

10
Schematics and Layouts / Re: Does A500 mean 500 ohms or 500k ohm
« on: March 17, 2020, 07:20:03 AM »
It does indeed mean 500 ohm.  You can get away with a much more common 1k potentiometer without major problems though.

11
Not sure how I missed this, but the Mid pot should be 500 ohm, not 500k !!!  I finally got a chance to play with the tone stack in a sim and found the error.  It makes a HUGE difference!

You can get away with a much more common 1k potentiometer though.

12
Guitar News / Re: Coronavirus hitting the music industry
« on: March 13, 2020, 01:02:57 PM »
Justin Bieber had a big tour booked in the US but ticket sales were slow so they had to change venues to smaller places. This was before the virus really got serious press. Now they may have to cancel the whole thing or postpone it.

The question I have is: If you get it once, are you immune or can you get it again ? Or is it like the flu and it mutates every year ?

From what I have gathered, it seems like the common cold regarding how your immune system works.  Meaning that if that exact strain came by again you should be fine if you were already exposed, but it will most likely mutate frequently and change causing you to potentially get re-infected.

13
Amplifier Discussion / Re: JC 120 speaker question
« on: March 11, 2020, 02:07:06 PM »

Ok, that makes sense.  I have another stereo amp that needs a 4 ohm load.  So I could build one 2-12 speaker cabinet with 4 ohm speakers and turn both amps into heads?  That might simplify things for me.

Sounds like that would work for you.

14
Guitar News / Coronavirus hitting the music industry
« on: March 11, 2020, 02:05:47 PM »
All performing artists are going to start feeling the hit of Coronavirus, even if they don't get infected.  Most large venue concerts have been cancelled or probably will be soon due to mounting concerns of the virus spreading even farther.  I recommend what others have been saying for a while now on this: wash your hands regularly, stay away from large group gatherings, keep yourself healthy (eating properly, exercise, plenty of sleep, etc) so you can combat it if you do get infected.

https://www.gearnews.com/coronavirus-worries-mount-over-effect-on-live-music-for-2020/

15
Amplifier Discussion / Re: JC 120 speaker question
« on: March 11, 2020, 10:53:32 AM »

Hi all.  Quick question, hopefully someone can show me what I'm missing.  I understand that the speakers used are 8 ohm.  The schematic shows that when you connect an external speaker you should also use 8 ohm, but it shows them connected in parallel, which would make it 4 ohms.  I would have thought 4 ohms was too low.

https://www.ssguitar.com/index.php?action=dlattach;topic=4786.0;attach=8708

Thanks!

I believe it is stable for 4 ohms.  The reason they use 8 ohm speakers internally is so that you can then connect the external speakers without dipping below 4 ohm total.  Also, circuits output more wattage at lower impedance.  So when running external speakers along with the internal, when set up as parallel and the amp sees 4 ohms total, it is a boosted output.  If you had internal and external 4 ohm speakers and hooked in series, it would work, but you would have the amp seeing 8 ohm and have a lower total wattage.

Pages: [1] 2 3 ... 147