Messages

1

Open Discussion / Re: JST connectors

« on: December 06, 2019, 11:31:58 AM »

The connectors I've shown essentially turn wires into a standard female header.  They mate with standard male pin headers, without any additional locking mechanism.

2

Open Discussion / Re: JST connectors

« on: December 06, 2019, 06:47:15 AM »

If I locate my crimping tool, I am thinking about giving it away with this connector set for this year's yet-to-be-announced PIF party.  Don't know if it is what you are looking for, but hopefully someone will be excited to receive it.

3

General Questions / Re: Quick question, Ohm's law!

« on: December 04, 2019, 03:22:42 PM »

There are several simpler approaches to the math, and very often we can make some time-saving assumptions.

Didn't mean to scare you with the meaty generalized version. 

4

General Questions / Re: Quick question, Ohm's law!

« on: December 04, 2019, 02:23:08 PM »

By the way, how do you do the maths for an inductor/cap filter?

The math gets "fun".

You do the math just like with resistors, but you substitute the impedance of the inductor or cap, which is a complex number and varies with frequency.

Impedance of a capacitor is 1/(jωC), and
impedance of an inductor is jωL, where:

j is sqrt(-1),

ω is frequency in radians per second (equal to 2πf),

C is capacitance in farads, and

L is inductance in henries.

I can keep explaining if you are still interested.

5

Open Discussion / Re: Just Saying -- the soapbox thread

« on: December 04, 2019, 05:33:12 AM »

I saw an article recently on that subject that hilariously used the phrase "butt chugging vitamin D".

Yoni Melanoma sounds like a fun band name though.   

6

General Questions / Re: Quick question, Ohm's law!

« on: December 03, 2019, 04:30:20 PM »

Voltage across that resistor won't be 18V unless you short the other end to ground.  Even if you do short it, the charge pump has a maximum amount of current it can source and it has its own output impedance, both of which would limit the voltage.  Beyond that, I'm not much help, except my gut says 1/4-W is fine.  I definitely recommend that you do not try to find a 15W resistor to put there.

7

How Do I? Beginner's Paradise. / Re: Damaged cap?

« on: December 01, 2019, 11:30:20 AM »

There's a 90% or more chance that your cap is still fine.  Generally, I'd say complete the build and see, unless the look of the cap bugs you.  Whether you can test it in circuit will depend on what it is connected to.

Care to share a pic?

8

General Questions / Re: total recall

« on: November 29, 2019, 08:24:33 PM »

9

Build Reports / Re: ABDX-PIF build

« on: November 25, 2019, 10:57:04 PM »

Just reporting this for completeness.

The squeals and whistles are largely gone when using a guitar for my test signal.  I'm definitely getting delayed signals out of both BBDs.  But, my circuit output appears to be simply my clean input.  There were a lot of options in the build docs (jumpers, component omissions and substitutions, etc.).  I'm going to double check to make sure I have properly implemented the configuration that I have chosen:

MN3005 BBDs
MN3101 clock
True bypass

10

Open Discussion / Re: Good Quality POTS!

« on: November 24, 2019, 01:07:36 PM »

Your repeated experiences of failure of pots could be due to poor soldering technique.  Make sure you give the pot time to cool down between making each solder joint, and set the pot somewhere in the middle of its travel when soldering it.  And of course, don't take longer than necessary when soldering them. 

If you really really need good pots, buy Bourns or CTS.  But, generally speaking, Alpha are perfectly fine.

11

Build Reports / Re: More 1590A builds...

« on: November 18, 2019, 09:42:42 AM »

Looks like someone is going to need a second sheet pan rack. 

12

Build Reports / Re: ABDX-PIF build

« on: November 16, 2019, 07:01:40 AM »

I have started to do some calibration and testing outside of the box.  There are all sorts of squeals and whistles, but the BBDs appear to be BBing.  I imagine long wires, lack of shielding, my breadboard, and the fact that my test signal is coming from my $20 oscilloscope that is also sitting unshielded on the breadboard next to the circuit are contributing to the symphony.  Too early in the process to worry about anything though, so I'm calling it a positive test so far.  I'll press forward and get it all working, then I will tackle the whistles. 

13

How Do I? Beginner's Paradise. / Re: Graphics

« on: November 15, 2019, 04:54:25 PM »

You can try and squeeze this in there. https://www.motleymods.com/collections/box-mod-diy-kits/products/1591b-20700-green   

If there's enough room for two batteries though.  Looks like the biggest part of that list.   

That would be awesome. I'm a sucker for novelty.  A vape stomp box? Brilliant!

Sent from my SM-N950U using Tapatalk

Oh my. I claim no responsibility when you are handling stoned customer complaints.   

14

How Do I? Beginner's Paradise. / Re: Graphics

« on: November 15, 2019, 02:47:40 PM »

I was thinking it could look intentional rather than slacking.  You could even plug the hole with a vaping mouthpiece. 

15

How Do I? Beginner's Paradise. / Re: Graphics

« on: November 15, 2019, 02:23:47 PM »

(Note the foot facing LED in the pic.  Oops.)

On a marijuana-themed pedal, you could get away with an open hole there. Just saying.