Search found 25 matches

by Matlevo12
17 Jan 2021, 12:50
Forum: Vintage Stompbox Corner ( ... - 1975)
Topic: Steven Space Chorus CH-12
Replies: 2
Views: 232

Re: Steven Space Chorus CH-12

Funny detail : The 4 switches on the DC-2 can't be pushed more than one at a time it's actually just 3 switches and one (mode 1) that just makes sure none of the others are pushed. On this one, since on this one all the switches can be pushed (they are latching dpdt) the first one is just not connec...
by Matlevo12
16 Jan 2021, 14:04
Forum: Vintage Stompbox Corner ( ... - 1975)
Topic: Steven Space Chorus CH-12
Replies: 2
Views: 232

Steven Space Chorus CH-12

Hi ! Since there seems to be no trace of this pedal on the internet (that I could find, at least), here's one ! It's exactly what it looks like : a Boss DC-2 Dimension-C chorus clone. https://i.postimg.cc/CLXmk32Q/20210116-135636.jpg https://i.postimg.cc/K87BjChL/20210116-135644.jpg The only other p...
by Matlevo12
13 Jan 2021, 14:41
Forum: Boutique Stompboxes dissected...
Topic: JHS Morning Glory V4
Replies: 21
Views: 3328

Re: JHS Morning Glory V4

Thanks a lot. I feel quite stupid about it, but tracing a pedal in the middle of the night probable didn't help. The track labeled "NOTHING" was disappearing below a smd electrolytic cap, not being connected to anything, and the best answer I could find was "AH ! It's a trick ! They w...
by Matlevo12
10 Jan 2021, 04:48
Forum: Boutique Stompboxes dissected...
Topic: JHS Morning Glory V4
Replies: 21
Views: 3328

Re: JHS Morning Glory V4

It's like a riddle : what does an opamp do when it's not powered ? It's not a question that has kept me awake at night as it is not how you would use an opamp. [...] Disclaimer - I accept no liability for any damage to persons, equipment or property caused by anyone pursuing this line of investigat...
by Matlevo12
09 Jan 2021, 14:16
Forum: Boutique Stompboxes dissected...
Topic: JHS Morning Glory V4
Replies: 21
Views: 3328

Re: JHS Morning Glory V4

Well... I finally found someone whith a "newer" morning v4, he very nicely lent it to me so I can have a look, and it's really interesting. But before sharing what I traced (if I ever manage to do it), I have a question for you well experienced and wonderful pedal electronics wizards, if y...
by Matlevo12
05 Dec 2020, 17:17
Forum: Boutique Stompboxes dissected...
Topic: JHS Morning Glory V4
Replies: 21
Views: 3328

Re: JHS Morning Glory V4

Still surprised that U2.1 would float it's (+) input during relay transition. Just seems like it is going to pop like no other. The LED's connected to it's output are also interesting. With out a dropping resistor, the current through the LED's is only limited by the current capability of the LM833...
by Matlevo12
01 Dec 2020, 15:42
Forum: Boutique Stompboxes dissected...
Topic: JHS Morning Glory V4
Replies: 21
Views: 3328

Re: JHS Morning Glory V4

It is strange that relay K1.1 would not only switch signal path but, also switch between bias points. During the switch transition, this op-amp would be unbiased and should hit one of the rails and make a loud pop (Necessitating pop mute circuitry). The conection of the LEDs is quite interesting ho...
by Matlevo12
01 Dec 2020, 14:56
Forum: Davidoff Library
Topic: The BOSS Book
Replies: 9
Views: 1113

Re: Boos book pdf

Send me a message :)
by Matlevo12
10 Nov 2020, 07:48
Forum: Davidoff Library
Topic: The BOSS Book
Replies: 9
Views: 1113

Re: Boos book pdf

Thanks for that, maybe one they they'll reprint the "Boss book" :)
by Matlevo12
05 Oct 2020, 07:05
Forum: Pedal Debugging & Troubleshooting Support
Topic: Radial Switchbone JX2 troubleshoot help
Replies: 0
Views: 528

Radial Switchbone JX2 troubleshoot help

Hi every one, A friend of mine gave me a faulty Radial switchbone jx2 (the v1, which looks like this https://www.radialeng.com/product/switchbone-aby ). Does anyone have some experience with those ? Here's what I did so far : I don't have a schem (and couldn't ffind anything online) so I just traced...
by Matlevo12
28 Sep 2020, 05:02
Forum: Boutique Stompboxes dissected...
Topic: JHS Morning Glory V4
Replies: 21
Views: 3328

Re: JHS Morning Glory V4

bmxguitarsbmx wrote: 26 Sep 2020, 17:51 ... Or, the circuit is wrong.
Haha, yes, that's a possibility, for sure.
If I manage to fix this thing I'll double check, I can post some pictures of it as well.
by Matlevo12
25 Sep 2020, 07:20
Forum: Boutique Stompboxes dissected...
Topic: JHS Morning Glory V4
Replies: 21
Views: 3328

Re: JHS Morning Glory V4

Your schematic of the extra V4 op amp has both halves numbered with pins 1-2-3, but I assume you mean the left half that's providing the added gain stage (U2.1)? If so, my guess is that JHS is switching VB to the non-inverting input to keep it running in idle mode when it's out of the circuit, so i...
by Matlevo12
24 Sep 2020, 21:24
Forum: Boutique Stompboxes dissected...
Topic: JHS Morning Glory V4
Replies: 21
Views: 3328

Re: JHS Morning Glory V4

That half of the op amp is being used to buffer the VB supply, providing a low impedance source. For example, see https://www.freestompboxes.org/viewtopic.php?p=279166#p279166 Hi. Thanks. Just to make sure that we're talking about the qame thing : I thought that the pins 1/2/3 were doing the Vb buf...
by Matlevo12
24 Sep 2020, 13:25
Forum: Boutique Stompboxes dissected...
Topic: JHS Morning Glory V4
Replies: 21
Views: 3328

Re: JHS Morning Glory V4

Something is looking weird to me, but I checked it again...

Isn't it strange that when the normal mode is engaged the non-inverting input of the extra (not used soundwise in this mode) opamp is connected to the 4.5V ? What could it add ?
by Matlevo12
22 Sep 2020, 08:20
Forum: Boutique Stompboxes dissected...
Topic: JHS Morning Glory V4
Replies: 21
Views: 3328

Re: JHS Morning Glory V4

Hi, Here's what I traced on my unit. I checked a few times but it was late so it might not be 100% accurate... but I'm pretty confident about it. Tell me if I should check something or it something looks weird. The parts are numbered differently on the v4 (at least the one I have) than on the older ...
by Matlevo12
20 Sep 2020, 13:05
Forum: Boutique Stompboxes dissected...
Topic: JHS Morning Glory V4
Replies: 21
Views: 3328

Re: JHS Morning Glory V4

Some thoughts off the top of my head: -The 4.5V supply LM833 may be oscillating. -Despite using a BJT input opamp, JHS used the 1M bias resistor for the 1st audio op amp like the Bluesbreaker (and KOT) it is derived from. Originally the Bluesbreaker used a 072 fet input opamp which doesn't need as ...
by Matlevo12
18 Sep 2020, 13:36
Forum: Boutique Stompboxes dissected...
Topic: JHS Morning Glory V4
Replies: 21
Views: 3328

Re: JHS Morning Glory V4

Anyone interested in pix of this while I have it apart trying to find out what's wrong? Looks a bit different than the schems I saw here. It uses two 833's, and two ss relays for switching. I'm getting some weird low end noise, like farting out with the gain switch on. looks like the gain switch en...
by Matlevo12
06 May 2020, 14:27
Forum: Boutique Stompboxes dissected...
Topic: Catalinbread - Pareidolia Harmonic Mesmerizer [traced]
Replies: 113
Views: 51058

Re: Catalinbread - Pareidolia Harmonic Mesmerizer [traced]

I'll post the end of my repair just in case someone has the same problem one day. It turned out I didn't have any problem other than the Q7 fet. I was hearing some noise because I was putting the volume at maximum and not switching the pedal on and off with a n actuel guitar signal passing through i...
by Matlevo12
30 Mar 2020, 14:20
Forum: Boutique Stompboxes dissected...
Topic: Catalinbread - Pareidolia Harmonic Mesmerizer [traced]
Replies: 113
Views: 51058

Re: Catalinbread - Pareidolia Harmonic Mesmerizer [traced]

Here's another pic and link to the little schem I made, sorry it came out really small on the forum https://i.postimg.cc/FhXtGF3D/pareidolia-v2-output.png?dl=1 https://i.postimg.cc/v41v0pwY/pareidolia-v2-output.png After a few tries I found the first culprit to my noisy pareidolia : the (only in v2)...
by Matlevo12
14 Mar 2020, 13:42
Forum: Boutique Stompboxes dissected...
Topic: Catalinbread - Pareidolia Harmonic Mesmerizer [traced]
Replies: 113
Views: 51058

Re: Catalinbread - Pareidolia Harmonic Mesmerizer [traced]

if the jfet is damaged from electrostatic discharge then it will be somewhere between working and not working. everyone needs to use proper storage and handling procedures when working with jfets. you should only buy them from sellers that have stored and handled them properly. do you even know if ...