Search found 390 matches

by floris
07 Nov 2023, 11:45
Forum: Modern Stompbox Effects (1975 - ...)
Topic: MXR - M-108 Ten Band EQ new version [schematic]
Replies: 79
Views: 142004

Re: MXR - M-108 Ten Band EQ new version [schematic]

> Why is it 18V?
Larger headroom.
I run mine on 9V without problems.
by floris
17 Apr 2023, 12:49
Forum: Amplifiers
Topic: Traynor YVM-1 Issues
Replies: 7
Views: 1225

Re: Ammo Can Reactive Load

Yes, the screen starts behaving as a plate, drawing lots of current, when its voltage goes above the plate voltage.
Please investigate why the plate voltage goes lower than the screen because this should not happen.
by floris
15 Apr 2023, 18:17
Forum: DIY Projects
Topic: Ammo Can Reactive Load
Replies: 20
Views: 7152

Re: Ammo Can Reactive Load

I hope that you find the problem!
Please keep us posted.
by floris
12 Apr 2023, 13:07
Forum: DIY Projects
Topic: Ammo Can Reactive Load
Replies: 20
Views: 7152

Re: Ammo Can Reactive Load

Great DIY project thanks! Because the two coils are oriented in the same manner, I guess the magnetic field of one inductor coil can couple into the other inductor coil. This will change the effective inductance and frequency response of the load box. Shouldn't the two inductors be oriented 90 degre...
by floris
05 Apr 2022, 17:29
Forum: Modern Stompbox Effects (1975 - ...)
Topic: MXR - M-108 Ten Band EQ new version [schematic]
Replies: 79
Views: 142004

Re: MXR - M-108 Ten Band EQ new version [schematic]

The 0805 series = 2012 in metric, so that is correct.
by floris
05 Apr 2022, 15:42
Forum: Modern Stompbox Effects (1975 - ...)
Topic: MXR - M-108 Ten Band EQ new version [schematic]
Replies: 79
Views: 142004

Re: MXR - M-108 Ten Band EQ new version [schematic]

I googled "16V PEN FLM 3216" and one of the first hits was: https://www.digikey.com/en/products/detail/kyocera-avx/CB017C0102JBA/3066281 That states "Film Capacitor 16V 25V Polyester, Polyethylene Naphthalate (PEN), Metallized - Stacked 1206 (3216 Metric)". So I think C18 is from...
by floris
04 Apr 2022, 16:22
Forum: Modern Stompbox Effects (1975 - ...)
Topic: MXR - M-108 Ten Band EQ new version [schematic]
Replies: 79
Views: 142004

Re: MXR - M-108 Ten Band EQ new version [schematic]

I would search for "680nF smd". Then make sure that the voltage rating is at least 18V. Then look for the correct size: SMD components have a package size type like "0805 (2012 metric)" or "0603 (1608 metric)". I don't know which package size is used in this pedal. See ...
by floris
04 Apr 2022, 16:00
Forum: Modern Stompbox Effects (1975 - ...)
Topic: MXR - M-108 Ten Band EQ new version [schematic]
Replies: 79
Views: 142004

Re: MXR - M-108 Ten Band EQ new version [schematic]

>Said cap 9 is 3,300pF and cap 18 is .68mf
Yes as said, C9 is 3,3nF and C18 680nF. These are regular values that can be found in all the regular places (like AliExpress, Mouser, etc).
by floris
21 Mar 2022, 17:02
Forum: Modern Stompbox Effects (1975 - ...)
Topic: MXR - M-108 Ten Band EQ new version [schematic]
Replies: 79
Views: 142004

Re: MXR - M-108 Ten Band EQ new version [schematic]

> "is cap 18 ( 250 Hz) a 680n? Same voltage? "
Yes and yes
by floris
14 Mar 2022, 18:27
Forum: Modern Stompbox Effects (1975 - ...)
Topic: MXR - M-108 Ten Band EQ new version [schematic]
Replies: 79
Views: 142004

Re: MXR - M-108 Ten Band EQ new version [schematic]

C9 should be 3,3nF (3n3). The DC power voltage is 18V so the caps should be rated for at least 18V.
by floris
14 Mar 2022, 17:48
Forum: Modern Stompbox Effects (1975 - ...)
Topic: MXR - M-108 Ten Band EQ new version [schematic]
Replies: 79
Views: 142004

Re: MXR - M-108 Ten Band EQ new version [schematic]

The schematic that I have shows 2 capacitors for the 4kHz band:
C9 3n3 (inside the opamp feedback loop)
C10 33n (connected to 4kHz slider)
by floris
17 Jul 2021, 15:50
Forum: Amplifiers
Topic: Suhr Reactive Load [schematic]
Replies: 152
Views: 76132

Re: Suhr Reactive Load [schematic]

Wow that looks great, good work!
by floris
12 Apr 2021, 19:43
Forum: Amplifiers
Topic: Suhr Reactive Load [schematic]
Replies: 152
Views: 76132

Re: Suhr Reactive Load [schematic]

But on a 16 Ohm load, that same 100W amp yields 40VAC. That will not work with those caps.
by floris
12 Apr 2021, 11:59
Forum: Amplifiers
Topic: Suhr Reactive Load [schematic]
Replies: 152
Views: 76132

Re: Suhr Reactive Load [schematic]

These 100VDC F&T bipolar caps have a 35VAC spec. A 100W amp on a 8 Ohm load yields 28VAC. Should be ok I guess.
by floris
11 Apr 2021, 18:10
Forum: Amplifiers
Topic: Suhr Reactive Load [schematic]
Replies: 152
Views: 76132

Re: Suhr Reactive Load [schematic]

The full signal out of a distorting amp will flow through the cap at frequencies above the low resonance peak, so that can be quite a current, for a 100 W amp with a 8 Ohm speaker load this can be around 3,5 A. Is there anybody who checked the ripple current or ESR specs of the bipolar electrolitic ...
by floris
10 Apr 2021, 12:12
Forum: Amplifiers
Topic: Suhr Reactive Load [schematic]
Replies: 152
Views: 76132

Re: Suhr Reactive Load [schematic]

That will work but imo is overkill and way too expensive. MKP film caps are very expensive for large capacitance values. You need a Bipolar Non-Polarized electrolitic capacitor which will be much cheaper. I guess two of these in parallel will be good enough (don't know about the ripple current spec ...
by floris
09 Apr 2021, 14:02
Forum: Amplifiers
Topic: Suhr Reactive Load [schematic]
Replies: 152
Views: 76132

Re: Suhr Reactive Load [schematic]

I would like to know the same, about the wire diameter of the coils... I guess you should take DC resistance and the max current that goes through it into account. From: https://www.reddit.com/r/diytubes/comments/g4u1fj/question_about_component_choices_for_an_aiken/ "The current rating of the i...
by floris
23 Mar 2021, 12:15
Forum: Amplifiers
Topic: Suhr Reactive Load [schematic]
Replies: 152
Views: 76132

Re: Suhr Reactive Load [schematic]

It looks like a very good transformer and work well for the output but I think it is overkill. The MZ-L one from Lehle is cheaper and will also work fine I think: https://www.banzaimusic.com/lehle-transformer-mz-l.html I would use an even cheaper one like this: https://www.thomann.de/intl/monacor_lt...
by floris
17 Mar 2021, 16:11
Forum: Amplifiers
Topic: Suhr Reactive Load [schematic]
Replies: 152
Views: 76132

Re: Suhr Reactive Load [schematic]

When you "... recorded my amp's direct output with a dummy resistor load plugged into the speaker socket ...", what kind of speaker sim did you use, IR or something else perhaps? An alternative for this Suhr reactive load is the Aiken Amps reactive speaker load design: http://www.aikenamps...
by floris
17 Feb 2021, 15:09
Forum: Amplifiers
Topic: Suhr Reactive Load [schematic]
Replies: 152
Views: 76132

Re: Suhr Reactive Load [schematic]

Ah right your amp already has a Line Out from the speaker output, you'll be fine.