Dumbleator In/Send/Return/Out Impedances
Moderators: pompeiisneaks, Colossal
Dumbleator In/Send/Return/Out Impedances
Hi all. I would like to know what are the nominal in/out impedances for the in/send/return/out jacks. I'm not an amp builder so I can't read schematics. I'm just curious if anyone had these values handy (roughly speaking since I know there are some design variations).
Re: Dumbleator In/Send/Return/Out Impedances
Send in: about 18 M Ohms
Send out: about 600 Ohms
Return in: 220 K Ohms
Return out: 250 K Ohms
Hope this helps. Regards, Jelle
Send out: about 600 Ohms
Return in: 220 K Ohms
Return out: 250 K Ohms
Hope this helps. Regards, Jelle
Re: Dumbleator In/Send/Return/Out Impedances
Thanks. I didn't realize that the main In had such a high input impedance.
- martin manning
- Posts: 13375
- Joined: Sun Jul 06, 2008 12:43 am
- Location: 39°06' N 84°30' W
Re: Dumbleator In/Send/Return/Out Impedances
I think the Send and Output impedances will depend on the control settings, so with 250k 10% log pots set at "noon," those impedances will be about 25k. I get 11Meg for the input ;^)
Re: Dumbleator In/Send/Return/Out Impedances
11M.... With what values? I have calculated this a long time ago, so my memory might be fuzzy...
- martin manning
- Posts: 13375
- Joined: Sun Jul 06, 2008 12:43 am
- Location: 39°06' N 84°30' W
Re: Dumbleator In/Send/Return/Out Impedances
Standard circuit: 1M and 27K to ground at the input, 1k8 bias resistor, 260V. I got my number by running a sim... it's so high it doesn't matter either way!jelle wrote:11M.... With what values? I have calculated this a long time ago, so my memory might be fuzzy...
- martin manning
- Posts: 13375
- Joined: Sun Jul 06, 2008 12:43 am
- Location: 39°06' N 84°30' W
Re: Dumbleator In/Send/Return/Out Impedances
Jelle, just for grins and mental floss I ran the numbers by hand and got 10.8 Meg. I'm always happy when I get the same number two different ways!
Re: Dumbleator In/Send/Return/Out Impedances
Haha, I think I know what my brain did to me... 18 and 10.8M... Even a brainscientist gets fooled by his own brain....
I used RDH4 when I calculated it....
I used RDH4 when I calculated it....