|
Potentiometer and Capacitor Questions - Can anyone help me ?
I am building a JCM900 Marshall guitar amplifier from a schematic and I have
a parts list that I am not sure about, specifically : Q1: Potentiometer Question -- I notice there are 8 potentiometers. There are labelled VR1 - VR8: VR1 - A1M VR2 - A1M VR3 - A1M VR4 - A1M VR5 - B220K VR6 - B22K VR7 - B220K VR8 - B22K Am I correct in assuming that A1M means Audio 1 MegaOhm ? Audio meaning logarithmic ? Also what does 'B' mean in VR5-VR8 ? Does B mean linear ? Q2: Capacitor Question -- I have a list of several Caps C08 - RAD 30000uF / 30v* C09 - RAD 33uF / 350v* C11 - 22uF / 50v (NO POLARITY)* C10 - RAD 33uF / 350v* What does RAD mean ? Any help greatly appreciated Stephen Mew |
Potentiometer and Capacitor Questions - Can anyone help me ?
What does Radial Mean ?
Sorry for the Newby Questions :) s "Russell Powell" wrote in message news:tToib.754905$uu5.131520@sccrnsc04... I believe the "A" is 1/4 Watt and the "B" is 1/2 Watt power ratings. The 1M is 1 MegaOhm and the 220K is 220 killoOhm. RAD stands for a "Radial" capacitor. -- sincerely, Russell Powell Artisan Components SR. FAE - U.S. Central 469-438-6589 "Steve Mew" wrote in message ... I am building a JCM900 Marshall guitar amplifier from a schematic and I have a parts list that I am not sure about, specifically : Q1: Potentiometer Question -- I notice there are 8 potentiometers. There are labelled VR1 - VR8: VR1 - A1M VR2 - A1M VR3 - A1M VR4 - A1M VR5 - B220K VR6 - B22K VR7 - B220K VR8 - B22K Am I correct in assuming that A1M means Audio 1 MegaOhm ? Audio meaning logarithmic ? Also what does 'B' mean in VR5-VR8 ? Does B mean linear ? Q2: Capacitor Question -- I have a list of several Caps C08 - RAD 30000uF / 30v* C09 - RAD 33uF / 350v* C11 - 22uF / 50v (NO POLARITY)* C10 - RAD 33uF / 350v* What does RAD mean ? Any help greatly appreciated Stephen Mew |
Potentiometer and Capacitor Questions - Can anyone help me ?
[...]
"steve mew" a écrit dans le message de ... What does Radial Mean ? Both capacitor's leads are on the same side rather than on the opposite sides (axial layout). Sorry for the Newby Questions :) But for the potentiometers with a "B", I don't know. Thierry C. |
Potentiometer and Capacitor Questions - Can anyone help me ?
A is for audio taper B is for linear taper
"Steve Mew" wrote in message ... I am building a JCM900 Marshall guitar amplifier from a schematic and I have a parts list that I am not sure about, specifically : Q1: Potentiometer Question -- I notice there are 8 potentiometers. There are labelled VR1 - VR8: VR1 - A1M VR2 - A1M VR3 - A1M VR4 - A1M VR5 - B220K VR6 - B22K VR7 - B220K VR8 - B22K Am I correct in assuming that A1M means Audio 1 MegaOhm ? Audio meaning logarithmic ? Also what does 'B' mean in VR5-VR8 ? Does B mean linear ? Q2: Capacitor Question -- I have a list of several Caps C08 - RAD 30000uF / 30v* C09 - RAD 33uF / 350v* C11 - 22uF / 50v (NO POLARITY)* C10 - RAD 33uF / 350v* What does RAD mean ? Any help greatly appreciated Stephen Mew |
Potentiometer and Capacitor Questions - Can anyone help me ?
Jimmy,
First, the caps. RAD probably means radial leads as opposed to axial. That is, like a can shape with two leads projecting out the same circular end cap and placed part way from the center to the edge of the circle rather than a can with a lead coming out each end and placed on the center axis of the cylinder. wrt the variable resistors (potentiometers), I think A and B initial letters more likely represent two different sections of the circuit. The only forms of pots that I'm familiar are the logarithmic (audio) and linear. Can't see how a B implies linear. I agree with the interpretation that 1M, 220K, and 22K probably are the nominal resistance values of the pots. btw--an old (literally) friend once corrected my mistaken impression so let me honor him by passing on that it's "megohm", *not* "megaohm". I was younger and very sure, but when I checked I found he was right. Rick Jimmy wrote: A is for audio taper B is for linear taper "Steve Mew" wrote in message ... I am building a JCM900 Marshall guitar amplifier from a schematic and I have a parts list that I am not sure about, specifically : Q1: Potentiometer Question -- I notice there are 8 potentiometers. There are labelled VR1 - VR8: VR1 - A1M VR2 - A1M VR3 - A1M VR4 - A1M VR5 - B220K VR6 - B22K VR7 - B220K VR8 - B22K Am I correct in assuming that A1M means Audio 1 MegaOhm ? Audio meaning logarithmic ? Also what does 'B' mean in VR5-VR8 ? Does B mean linear ? Q2: Capacitor Question -- I have a list of several Caps C08 - RAD 30000uF / 30v* C09 - RAD 33uF / 350v* C11 - 22uF / 50v (NO POLARITY)* C10 - RAD 33uF / 350v* What does RAD mean ? Any help greatly appreciated Stephen Mew |
Potentiometer and Capacitor Questions - Can anyone help me ?
On Mon, 20 Oct 2003 12:07:08 GMT, Rick Cooper
wrote: wrt the variable resistors (potentiometers), I think A and B initial letters more likely represent two different sections of the circuit. The only forms of pots that I'm familiar are the logarithmic (audio) and linear. Can't see how a B implies linear. whether or not you can see how it implies it, I can verify that that is in fact the case :) A = audio B = linear I've got a couple of each sitting right here, and i've seen plenty of them in guitar effects circuits. |
| All times are GMT +1. The time now is 03:50 AM. |
Powered by vBulletin® Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Copyright ©2004 - 2014 DIYbanter