You are on the list and I will find (or generate) pricing for the kit in a few days.
Doug
Not as many options for the inductors, Avcc is not separate.
Attachments
I have boards and am ordering IC's.
The kits will have to be on hold until one member is not interested in his request or I get sufficient order for a few more.
I will put you on the waiting list for kits.
Doug
AVCC shouldn't be separate
Through hole inductors with prefilter snubber under them on other side, single snubber design? Hiamp has even no groundplane under inductors, Sagami has an article/explanation on their website that may tell why. Not certain it is relevant, but Sagami thinks it is, and technicians measuring their and Icepower inductors seem to like them. Nice compact output, big powerinductors prevent that on dug1.
AVCC shouldn't be separate
A ground plane under "bobbin" or "unshielded" inductors could act as a shorted turn in the magnetic field...significantly changing equivalent inductance.
In the RF world an "open" coil should be clear of ground planes by 2.5 times diameter.
Try to use shielded inductors or at least ones where the core gap is in the middle of the assembly.
Hi,
I've been able to find most of the parts on mouser.fr with the refs of Dugs BOM in post #180
For few other I've had found alternative parts, see below.
Could someone, check they are OK ?
Original part number -> Alternative part number
--------------------------------------------------------------------------------------------------------------------
C8,C11 - 0.1UF 50V x7r 1206 - CC1206KRX7R9BB104 -> C1206C104K5RACTU - SM/C_1206 - power supply bypass
C9,C10 - 1000PF 50V cog 1206 - CC1206JRNPO9BN102 -> C1206C102J5GACTU - SM/C_1206 - supplybypass
C18,C21 - 1000PF 50V cog 1206 - CC1206JRNPO9BN102 -> C1206C102J5GACTU - SM/C_1206 - output filter ccts
C19,C20 - 0.68UF 50V x7r 1206 - CGA5L2X7R1H684M160AA -> C1206C684K5RACTU - SM/C_1206 output filter cct
R8,R9 - 10R 1206 - CRM1206-FX-10R0ELF -> CRCW120610R0FKEA - SM/R_1206 - direct output snubber cct
I've been able to find most of the parts on mouser.fr with the refs of Dugs BOM in post #180
For few other I've had found alternative parts, see below.
Could someone, check they are OK ?
Original part number -> Alternative part number
--------------------------------------------------------------------------------------------------------------------
C8,C11 - 0.1UF 50V x7r 1206 - CC1206KRX7R9BB104 -> C1206C104K5RACTU - SM/C_1206 - power supply bypass
C9,C10 - 1000PF 50V cog 1206 - CC1206JRNPO9BN102 -> C1206C102J5GACTU - SM/C_1206 - supplybypass
C18,C21 - 1000PF 50V cog 1206 - CC1206JRNPO9BN102 -> C1206C102J5GACTU - SM/C_1206 - output filter ccts
C19,C20 - 0.68UF 50V x7r 1206 - CGA5L2X7R1H684M160AA -> C1206C684K5RACTU - SM/C_1206 output filter cct
R8,R9 - 10R 1206 - CRM1206-FX-10R0ELF -> CRCW120610R0FKEA - SM/R_1206 - direct output snubber cct
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The first one is a good choice as it is thicker than the original.
The 1000pF and 0.68uF would not be a good sub IMHO as they are thinner than the original.
There was some discussion (somewhere on diyaudio) about capacitance changes vs DC bias voltage of non-COG(NPO) ceramic caps.
A Murata site was listed as a place to go to compare caps vs DC bias.
It was interesting.
I used to think that the higher voltage rating reduced the effect that DC bias had on the capacitance change.
I was w-w-w-wrong.
I have changed my thoughts to the thickness as the important factor.
Investigate yourself but this is what I think now.
Doug
The 1000pF and 0.68uF would not be a good sub IMHO as they are thinner than the original.
There was some discussion (somewhere on diyaudio) about capacitance changes vs DC bias voltage of non-COG(NPO) ceramic caps.
A Murata site was listed as a place to go to compare caps vs DC bias.
It was interesting.
I used to think that the higher voltage rating reduced the effect that DC bias had on the capacitance change.
I was w-w-w-wrong.
I have changed my thoughts to the thickness as the important factor.
Investigate yourself but this is what I think now.
Doug
Attachments
1206 0.1uF--> search for cog/npo and pick one 50V you like, Murata helps people with simtool so i Always pick them if possible
1206 1nF/1000pF ---> cog/npo plenty available pick a 50V you like
1206 0.68uF ---> pick a good one LOL 100V could also be adviced in this position, it will see highest voltage when amp is oscillating
NPO/COG: no voltage change, no distortion smeared all over like classII (xr7 etc) ceramics, might even be better than many fullsize filmcapacitors. Size or voltage don't matter with COG for distortion, nor does temperature. ESR lower than all others that could fit in same spot, distortion lower than all others that could fit in same spot, you get the picture
So let me get this clear
You had requested 3 boards with 3 IC's and 3 kits all installed.
Now you want just 1 pair (2 amps joined) board only?
Yes?
Got it.
I will invoice after this weekend...have some catching up to do with builds and shipments.
Mute switch
I had a DPDT toggle switch on the front panel from earlier use of the case I am now using with my DUG amp. Thought may as well use it as a mute switch, just cos its there! So I connected it but doesn't mute the amp. The switch definitely causes the mute terminals to go close circuit when switched to mute, open otherwise.
Any ideas? Anybody else using the mute switch?
I had a DPDT toggle switch on the front panel from earlier use of the case I am now using with my DUG amp. Thought may as well use it as a mute switch, just cos its there! So I connected it but doesn't mute the amp. The switch definitely causes the mute terminals to go close circuit when switched to mute, open otherwise.
Any ideas? Anybody else using the mute switch?
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