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Topics - Tassieviking

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G'day
I found a circuit an a Russian web page and decided to make myself a PCB using KiCad so I can practice some SMD soldering.
I am calling the PCB "Micks Thick As A Brick", I have no clue if the circuit will work, but I had fun making it up.
I have ordered 5 PCB's from JLCPCB and will make one up some time in the future.If it works I will post that here.
The PCB can be cut in half and rejoined back to back so it might fit in a 1590A box (maybe).
Not all components are used, if the transistors are used then the R5,R10, R20 resistors are not used.
If the top half of the PCB is only used, then don't use the transistors or R43, R44, R45, R46, R47 and C36.
The SMD PT2399 should be the ones available from Tayda.
Just study the circuit and work it out.

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Schematics and Layouts / Marshall Mosfet 3210, 5213,5215 Power Amp PCB
« on: November 05, 2021, 12:52:57 PM »
G'day
I made up a PCB for the Marshall Mosfet 3310, 5213, 5215 amplifier, I used KiCad to make it but I have no idea if the transistors I substituted will work right.
The Mosfets in the circuit might not be available any more neither, but you can just run wires to whatever you want to use after they are mounted on a heatsink
The original Mosfets were TO-3 type connected with wires running back to the PCB.
I have no idea what the choke or inductor value should be, or the resistor it is wound around, I asked the Marshall tech support and they had no clue either.
The footprint for the choke and the resistor  it is wound around are on top of each other.
Will it work ?  I guess I will find out when I build one, I have 5 PCB's on the way from JLCPCB
I am a complete beginner when it comes to making up PCB's so anything can happen. I have built amps and stuff a long time ago,and then I became a sparky for 40 years.
Anyhow, here are some  pics and files.
Cheers....Mick
 

3
G'day
I made this PCB up for myself using KiCad so I can make up some Marshall SS amps, and the Marshall Artist SS pre and valve main amp.
This is not tested and but I have ordered 5 PCB's for myself and they are on the way.( Use at your own risk )
I used the footprints for the Tayda A-5079 PCB mount Jack Sockets and Alpha (Taiwan) pots.
The 2.2uF Electrolytic caps footprint will also fit MKS caps 7.2mm x 7.2mm 5mm Pitch, thats why they look strange on the pics.
IGNORE VALUES IN SCHEMATIC......use the ones in the component list, the schematic is mixed up with values from the various versions.
The 5213 Mosfet also has a clean channel and this is on the PCB as well, only first 3 pots and 2 inputs are on the PCB and the rest of the pots are wired up from plugs on the PCB.
I made up the spacing between pots and sockets etc. myself and it does not correspond to an actual Marshall amp (I think)
I made it to fit into a rack-mount case or whatever I can get cheap.
If I have any problems when I build one I will leave a message, anyone can use the files anyway they want.
I leave the Gerber files I sent to JLCPCB to order my PCB's.
Also the Kicad files if you can open them (might need my modified footprints ? I don't know how to save them yet.)
Cheers.....Mick


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Schematics and Layouts / Sunn Beta PCB
« on: November 05, 2021, 10:51:07 AM »
After thinking about it for a long while, I finally decided to create a Sun Beta PCB for myself and order some.
I was trying to work out the correct dimensions between the pots but it was really hard, until Fishheadjoe posted some pics for me of his head on the TalkBass forum.
The spacing is most likely not spot on but it is as close as I can get unless I have a original PCB to work from.
I made the PCB up in Kicad, and I added some of my own mods because I like them.
All the 2.2uF NP Electro capacitors ( originally 2uF ) can be used or there is space for WIMA MKS type at 5mm pitch and up to 7.2mm x 7.2mm body in the same place.
I made it for both Bass and Lead, just remove the pots you don't need, Lead - remove the Bass Level pots and Bass Master pot, Bass  - remove the reverb pots and Lead Level and Master.
I bet some who look at the pics will think it has some funny spider pot on there instead of either a Lead Reverb or Bass Level in the same place.
I also added a different power supply plug where the power goes through a 7815 and 7915 regulator in case it is needed to make +-15V
Just delete C1 D1 U1 C2 D2 U2 and the 18-35V supply plug if you already have a +-15V supply handy.
I also made a different footprint for the supply caps C156, C157, C1, C2,  originally C156 and C157 was 10uF 25V, the footprint will fit caps up to 10mm with 2.5mm or 5mm pitch so you can go for a higher value if you want.
The foot Switch circuit is one I got from DiscoVlad on the FSB forum, he used it and said it works fine. Original chips used by Sunn are too hard to find.
This PCB is not tested to see if it works so use at your own risk
I have ordered 5 PCB's from JLCPCB and am waiting for them to arrive, I will post if I have any trouble with them, Its my Xmas present for myself.
I am going to stick it in a 2U or 3U ( front send / return jacks ) rack mount case for myself and my daughter, Lead for me and Lead and Bass for my daughter.
I made all the connectors Molex KK396 type as Tayda carries them and I get most of my components from them when its for me or my daughter, I might just solder wires straight to the PCB though instead of using connectors.

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Amplifier Discussion / Sunn SL260 Help Needed With Pot Orientation
« on: October 10, 2021, 11:55:10 AM »
G'day
I am drawing up the Sunn SL260 into KiCad so I can make the preamp PCB for myself.
I have hit a roadblock as I cant work out the orientation of the Pots in the tone section
can someone please check and advice me how they should be mounted, ie, pin 1 on pots.
That's the Bass, Mid, Mid frequency, Treble pots.
I have also made some mods to the original circuit, power supply and foot switch circuit for reverb, do they look ok ?
Thank you for any help.
Michael

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