Search found 11 matches

by krueppel-keile
13 Jul 2013, 09:58
Forum: Modern Stompbox Effects (1975 - ...)
Topic: Hughes & Kettner - Rotosphere [schematic]
Replies: 104
Views: 57820

Re: Hughes & Kettner - Rotosphere [schematic]

It is nice that you want to make your own layout. The schematics are correct, at least as far as i can tell (and that is not too much, but at least it sounds nice and does all the things it should do). I would never have the nerves to sit down and make a layout of that size myself, instead i used th...
by krueppel-keile
16 May 2013, 08:59
Forum: Modern Stompbox Effects (1975 - ...)
Topic: Hughes & Kettner - Rotosphere [schematic]
Replies: 104
Views: 57820

Re: Hughes & Kettner - Rotosphere [schematic]

Hello, After some time i got in a certain mood and went back to this project, and made some progress. I did some audio probing, and it turned out that one of the MN3207 BBDs didnt work (no output signal). I replaced it, that solved the problem with the two channels having different output levels. Al...
by krueppel-keile
14 May 2013, 13:17
Forum: Modern Stompbox Effects (1975 - ...)
Topic: Hughes & Kettner - Rotosphere [schematic]
Replies: 104
Views: 57820

Re: Hughes & Kettner - Rotosphere [schematic]

Hope that helps: "12V-Diode" just means that the prewired resistor is already set for a 12 Volt supply, so you should be good to go. Just make sure to get the polarity right :D Otherwise: Resistance = (E-U)/I, where E is the supply voltage, U is the voltage drop across the diode, and I is ...
by krueppel-keile
18 Jan 2013, 12:23
Forum: Modern Stompbox Effects (1975 - ...)
Topic: Hughes & Kettner - Rotosphere [schematic]
Replies: 104
Views: 57820

Re: Hughes & Kettner - Rotosphere [schematic]

I will test stereo mode, the problem right now is that the output levels on both channels are very different. There is probably a wrong resistor somewhere, but i havent searched for it yet. There are also 6 trimmers, two of them conntected to the MN's dont do anything apparently, while the other fou...
by krueppel-keile
17 Jan 2013, 21:13
Forum: Modern Stompbox Effects (1975 - ...)
Topic: Hughes & Kettner - Rotosphere [schematic]
Replies: 104
Views: 57820

Re: Hughes & Kettner - Rotosphere [schematic]

I bought the parts here and there and dont have all the bills at hand, but i estimate around 150€+-20. With so many parts, it really adds up. Of course, the frustration and headaches are priceless :) I made a quick sound demo, the loud humming noise is a recording issue with my sound card. I dont ha...
by krueppel-keile
26 Jun 2012, 15:40
Forum: Modern Stompbox Effects (1975 - ...)
Topic: Hughes & Kettner - Rotosphere [schematic]
Replies: 104
Views: 57820

Re: Hughes & Kettner - Rotosphere [schematic]

Hey folks, Sorry for not posting for ages, other stuff kept bothering me for a while. I completed the circuit around two moinths ago, and of course it didnt work first. I tossed it aside for a while and only checked on it now and then. Two days ago, i finally got it to work :D . I had many errors to...
by krueppel-keile
25 Feb 2012, 20:26
Forum: Modern Stompbox Effects (1975 - ...)
Topic: Hughes & Kettner - Rotosphere [schematic]
Replies: 104
Views: 57820

Re: Hughes & Kettner - Rotosphere [schematic]

Ok, i found something, if youre interested:
Ths guy replaced the momentary breaker switch on the rotosphere mk1 with a "normal" switch, this way you dont have to hold down the breaker switch all the time.
Its written in german, but has many pictures so you should get the idea.
by krueppel-keile
14 Feb 2012, 12:24
Forum: Modern Stompbox Effects (1975 - ...)
Topic: Hughes & Kettner - Rotosphere [schematic]
Replies: 104
Views: 57820

Re: Hughes & Kettner - Rotosphere [schematic]

Okay, now for some some shitty webcam pics: https://i1172.photobucket.com/albums/r566/krueppel-keile/120214-102318.jpg https://i1172.photobucket.com/albums/r566/krueppel-keile/120214-102330.jpg https://i1172.photobucket.com/albums/r566/krueppel-keile/120214-102358.jpg https://i1172.photobucket.com/a...
by krueppel-keile
11 Feb 2012, 13:13
Forum: Modern Stompbox Effects (1975 - ...)
Topic: Hughes & Kettner - Rotosphere [schematic]
Replies: 104
Views: 57820

Re: Hughes & Kettner - Rotosphere [schematic]

I started to build one of these with the help of ssmc's layout. I found a few errors, the in/outputs are strange and there was a resistor in the oscillator circuit that was connected wrong. Lets get that thing to work! Im sure its possible unless some diabolic H&K person put some errors into the...