I bought 2 Alps Blue Pots (mono) from Angela Instruments for $19 each. They look just like Angela picture and Ebay's picture except the shaft and the 4th pin. My Angela pots are plastic with a number of (136X 250KA) I don't see these numbers listed either on the Alps page. I suspect these pot...

While looking for pots I found a couple of suppliers in Hong Kong. I bought 4 of them for one man, waiting on their delivery, but was contacted by another man who said he could supply me with pots for a better price. Here are the pots: ALPS 100K AUDIO AMPLIFIER POTENTIOMETERS Made in Japan...

Thanks for the reply, < "Won't work"? I hate that phrase. > I am jumping to a conclusion that I shouldn't. I did not do any testing. I plugged in a Sure 57 (I used a cable with XRL on one end and a ¼ ring tip sleeve on the other) and turned up the gain on the tape recorder; no signal at...

Thanks Rick, I would be interested in any links you find about RF filtering. After our discussion yesterday I plug my bass into my Szekeres (it is a DC-coupled gain stage version) and then into my mixer. There was still no volume, and some noise. I then listen to the bass through the Szekeres...

Thanks guys for the help, Rick, those sites are excellent. I couldn't find anything like those using search engines. After hearing you guys explain things I think I'll go back and build a Headwize amp, maybe "The Morgan Jones Mini Tube Headphone Amplifier" by Chu Moy. PRR, you understand me...

Thanks PRR for the reply, The speaker part of the project I can handle. I've been a Bass List subscriber for a few years and have built a few speakers already. My plan was to use 2-10" and a PR. Like you say you can't fight physics. A bass speaker is large and heavy. I will make it portable...

I would like build a preamp and a portable speaker for an acoustic bass guitar. I've been looking around the internet and have not found any pages explaining what needs to be done. Impedance is my first problem and I have not yet come to really understand it. Is it possible to use a headphone...

Thanks guys for the help. I'm afraid PPL a lot of what you said sailed right over me. I understand that the BUF-634 will not work in my situation because it needs to follow a FET. I also understand that the BUF-04 would work but it is not as good as the EL-2004, EL-2005, or the LH-0033. Casscode...

Possum used a link, in a reply, to a Stereophile review. I found it fascinating reading. http://www.stereophile.com/showarchives.cgi?54:1 I need to build a few buffering circuits and was wondering if the BUF-03, mentioned in the article, is still a great buffer? I see the article was...

I bought a Noble stereo 50k pot but don't know if it is an audio or linear taper. How can I test it to find out? What does the different ohm ratings of pots do to audio. I see them from 10k to 500k. Is one better than another? Why does the Noble pot have 4 pins for each pot? Are all Noble pots...

I'm having a tough time with volume potentiometers. I understand carbon pots are cheap and add noise. Mouser and Digi-Key have a bunch of precision wirewound pots but they are all linear tapers. Is conductive plastic better than all other materials I've read that we need a log or audio taper. Is...

Thanks a lot guys for the replies. I will use the LED plug without the built-in resistor and experiment with resistors until I find the right ones. I ask the fellows at work the same question, they are railroaders, and they said keep putting in bigger and bigger resistors until the LED's quit...

I am trying to add an LED as an ON indicator to a toggle switch. Mouser offers a plug for an LED with a built-in resistor. My problem is I don't know how to figure out the resistor size I need. I will be switching 15volts on and off and the LED only needs 2.2 volts at 20mA. Can someone help me...

I have a small portable mixer (4 channel) that is power by a 9volt battery. It is a Boss Micro Mixer Km-04. I run out of headroom real quick with this thing and a battery only last a couple of days. I use it right beside my Szekeres headphone amp and it's oversize regulated 15 volt power supply...

I have a pair of Bach-Simpson larger VU meters that I want to use with a stereo mic preamp that I am building. I bought these meters from a guy in Canada who parts out large mixing boards as sells the parts. I was thinking of using the VU And PPM Audio Metering drive that is on Elliott Sound...