impedance match for woolly mammoth

[tm486]

[quote name='martindupras' post='1184092' date='Mar 31 2011, 11:18 PM']I did say I was tired.

You're right. At 1/4 vol you have 3/4 of the resistance. If you have a 500k pot you'll get 0-500k resistance. If you wanted to restrict the range you could put another resistor in series, e.g. 250k resistor + 250k pot would give you a range of 250k-500k. I think.

- martin[/quote]

If i restrict the range then i will need to add a switch to make it bypass for when i use a passive bass, if i just use a larger value pot then when it is turned all the way up then i can use passive basses without the need for a switch. And depending on the output of my active basses i would just need to have it nearly all the way down.

Also, i have just remembered that it sounded good when at 25% AND i had the backtrack before the fuzz. So i assume that i would need an even larger pot? maybe a 1M pot? either way, they aren't expensive, i'll get both and test it i think.

Thanks

Tom

Edited March 31, 2011 by tm486

[martindupras]

True. Can't argue with the logic.

- martin


[quote name='tm486' post='1184103' date='Mar 31 2011, 11:30 PM']If i restrict the range then i will need to add a switch to make it bypass for when i use a passive bass, if i just use a larger value pot then when it is turned all the way up then i can use passive basses without the need for a switch. And depending on the output of my active basses i would just need to have it nearly all the way down.

Also, i have just remembered that it sounded good when at 25% AND i had the backtrack before the fuzz. So i assume that i would need an even larger pot? maybe a 1M pot? either way, they aren't expensive, i'll get both and test it i think.

Thanks

Tom[/quote]

[tm486]

Hi,

I bought the components today, but i wont be able to use a soldering iron until monday. Just to make sure i don't mess it all up, where do i solder the wires to on the jacks?

I bought these as maplins had none of the normal type in stock, i assume they are the same, these just have tabs to solder to instead.

[url="http://www.maplin.co.uk/1-4-mono-socket-withchrome-bezel-1263"]http://www.maplin.co.uk/1-4-mono-socket-wi...rome-bezel-1263[/url]

So does anyone have a diagram of how i would wire this all together, or to be honest a simple explanation will do. I just got home and realised that i whilst i understand the concepts involved, i dont know where to solder things to on the actual jack. Also, on the potentiometers, would i use the two outer pins? or one of the outer pins and the middle pin?

Thanks

Tom

[GarethFlatlands]

[quote name='tm486' post='1184998' date='Apr 1 2011, 05:08 PM']Hi,

I bought the components today, but i wont be able to use a soldering iron until monday. Just to make sure i don't mess it all up, where do i solder the wires to on the jacks?

I bought these as maplins had none of the normal type in stock, i assume they are the same, these just have tabs to solder to instead.

[url="http://www.maplin.co.uk/1-4-mono-socket-withchrome-bezel-1263"]http://www.maplin.co.uk/1-4-mono-socket-wi...rome-bezel-1263[/url]

So does anyone have a diagram of how i would wire this all together, or to be honest a simple explanation will do. I just got home and realised that i whilst i understand the concepts involved, i dont know where to solder things to on the actual jack. Also, on the potentiometers, would i use the two outer pins? or one of the outer pins and the middle pin?

Thanks

Tom[/quote]

Doh, just typed a whole explanation about stereo jacks and battery connections, forgetting the circuit doesn't need batteries. A mono jack should work fine. From the picture you've linked on the Maplin site, the left hand lug connects to ground on the circuit and the right hand one is the signal, so 'in' on the diagram on the site.

If you look at the pots from the front (post upwards) and turn it anti-clockwise 90 degrees, the pins now relate to the 3 connections on the diagram from bottom to top according to here; [url="http://sound.westhost.com/pots.htm"]http://sound.westhost.com/pots.htm[/url], just over halfway down.

Hope this helps.

[tm486]

[quote name='GarethFlatlands' post='1185435' date='Apr 1 2011, 11:41 PM']From the picture you've linked on the Maplin site, the left hand lug connects to ground on the circuit and the right hand one is the signal, so 'in' on the diagram on the site.

[url="http://sound.westhost.com/pots.htm"]http://sound.westhost.com/pots.htm[/url], just over halfway down.

Hope this helps.[/quote]

Hi,

That site is just what i was looking for, thanks. with regards to the jacks, do i connect 'in' to 'in' and ground to ground? And would the pot go between the two signal lugs?

Thanks

Tom

Edited April 2, 2011 by tm486

[GarethFlatlands]

Not sure what you mean about the pots, and not 100% sure I'd be able to help as you've said you want to make a slightly different circuit with footswitching and an LED. My DIY pedal skills aren't good, having not got round to building any pedals ever, despite meaning to.

Maybe someone else with a bit more experience can offer some assistance?

[tm486]

[quote name='GarethFlatlands' post='1186332' date='Apr 3 2011, 12:06 AM']Not sure what you mean about the pots, and not 100% sure I'd be able to help as you've said you want to make a slightly different circuit with footswitching and an LED. My DIY pedal skills aren't good, having not got round to building any pedals ever, despite meaning to.

Maybe someone else with a bit more experience can offer some assistance?[/quote]

Hi,

The original idea was to create something with a switch and an LED, but i have since decided that this isnt necessary as i can just reduce the resistance until it is negligible using the pot. i think i'll just experiment with it until it works. the website you provided about the variable resistor was helpful though.

Thanks

Tom