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Messages - Tassieviking

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The only tiny speakers I have ever noticed decent sound from are in soundbars or computer speakers, a very few of these sound ok, sort of.
They are meant to be small with big sound, but I imagine they might sound crap if you take them out of the housing they are in.
If you find some cheap at a tip shop or second hand shop it might be worth a try.
I have a small sound bar on my computer which can get fairly loud, the speakers are very small in it, I'm sure I could drive it straight from a preamp pedal.
I have a Sunn Beta Lead pedal I might try it with one day.

Amplifier Discussion / Re: Want to fix my Traynor Bass Mate 25
« on: January 17, 2022, 08:55:15 AM »
I think the circuit diagram is in the first post on this link

Schematics and Layouts / Re: Randall RG100 G3 Plus
« on: December 02, 2021, 09:56:21 AM »

Amplifier Discussion / Re: Peavey Bandit as speaker cab
« on: November 18, 2021, 07:40:47 AM »
I agree that you need to run the speaker wires into a Jack Socket mounted in the cab of the Bandit.
I'm not sure what you have now, but you could get a small box, like a pedal box 1590B, and mount it in the cab, and then mount your jack socket in there.
You will need a small patch lead with 2 x 1/4" male plugs on it to connect the Peavey speaker to the Peavey Amp.
I don't know where you live so I can't recommend a shop.
I Like Tayda for most of my parts online, but there are so many other great shops to get gear from.
Tayda is very cheap, and the postage is very good too in my opinion, but I just fiddle with stuff for me and family, home use.

I find Kicad great, I have only used it for less then a year now I think, but I am making up my own foot-prints and I have made some PCB's as well. :dbtu:
I am not sure when I will attempt the SMD practice as I am going to build some SS amps first, The Sunn Beta amps both Bass and Lead and also some Marshall Mosfets, and I also got some PCB's coming for the Sunn SL160/SL260 amp, but the SL160/SL260 is not supposed to be that good sounding.
The practice board should make up a BTDR2 on one half and the other half is the 5V reg, and the in/out amps with speed etc.
You can make a stock BTDR2 or an adjustable decay and frequency one if you want with that PCB.
Cut the board in half and join back to back and it should fit in a 1590A pedal.
I want to experiment to see if I can use this in a SMD sunn beta amp pedal with reverb and class D power amp eventually. (1590BB)
That's if it works, if not at least I will get some soldering practice and have fun doing it.

Schematics and Layouts / Re: Sunn Beta PCB
« on: November 06, 2021, 01:51:02 AM »
I remember reading that post on the Sunn forum a long time ago, thanks for reminding me LoudThud

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.

Schematics and Layouts / Marshall Mosfet 3210, 5213,5215 Power Amp PCB
« on: November 05, 2021, 12:52:57 PM »
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.

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.)

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.

Guitar News / Re: Bogner Ecstasy Mini - The mini solid state amp that rips
« on: November 05, 2021, 12:15:45 AM »
Sound great, now we just have to get the schematic for it. :)

Amplifier Discussion / Re: 80's Era Roland JC50 blows internal fuses
« on: October 27, 2021, 10:04:02 PM »
Do you have the serial number ?
The circuit is different after a certain serial number.
A photo of the back of the Jack socket for headphones might help.

Amplifier Discussion / Re: Sunn SL260 Help Needed With Pot Orientation
« on: October 15, 2021, 06:16:01 AM »
Thanks for all that info Phatt.
I definitely live in Tassie, where the Devils roam free. ( I have had them under the bedroom, makes you jump when they scream at night. )
I was born in Sweden but moved to Australia when I was 12, I still remember climbing on Viking rune-stones as a kid, they were all around the area where I lived.
I went back to Sweden in 1976 when I was 16 for a holiday, but it was still too bloody cold, stayed down under since then.

I am interested in solid state guitar amps off all kinds, I am going to order PCB's for Marshall Mosfet 3310 and Sunn Beta very soon and I just wanted another type of preamp for the order.
I order my PCB's from JLCPCB and find it better if I have a lot of different boards in one order, postage is the killer, but does not increase too much for more boards.

I like to stick circuits into KiCad and making circuit boards up for myself, I find it relaxing, I will have to learn the simulation bit soon in KiCad or some other software.
I don't have much experience in audio circuits, but been a sparky since 1980, mainly industrial maintenance repairing DC and AC drives and any other electronic boards that needed it to keep machinery running. My only tube experience was with high voltage spark testers checking insulation in cable manufacturing.

I have never seen a Sunn SL160 or SL260 in my life, but I might just have the preamp made by Xmas. (Just for fun)
I do love Rod's circuits and have looked at nearly all of them, I have read up on the reverb circuits on his page, but I will stick to what was original on the Sunn SL260 circuit.

Again, thank you for your help, I' gonna start reading up on what you mentioned now.

The Newcomer's Forum / Re: Busking Amp for Bass & Vocals
« on: October 12, 2021, 12:39:11 PM »
I just looked at the TDA2003 spec sheet, it looks like you would get 4 watts at 12 volts, not enough for bass in my opinion, but I am not an expert.
If you have the kit, build it and run your send/line out/ to effects output of your amp into it, and run the output to a separate cab and see what it sounds like.
Or get the signal from your stereo/phone/MP3 player and try it, see how loud the music sounds.
If its not enough the just get another amp module, like I mentioned before, the TPA3116D2 has 15 watts at 12v on the spec sheet at 4 ohm speaker.
You will not us a lot of extra power with a TPA3116D2 if you keep the volume down.
Class D power amps are very efficient and only use a bit more then what you use, if you use a 100w class D amp and only turn it up to 10Watt you will only use about 12-13 watts of power, at least that's my understanding.
Check the spec sheets of the power amp you are thinking off using and find the power rating for the voltage you intend to use, that's what I would do.
Class D amps don't need big heatsinks as well which saves money and weight.

The Newcomer's Forum / Re: Busking Amp for Bass & Vocals
« on: October 12, 2021, 11:47:20 AM »
If you are busking I imagine you might be doing it mainly during the day, have you considered a small solar cell ?
You can get a 20 watt panel that would be smaller then the top of a small amp with a 10" speaker in it.
The solar panel would continuously top up the battery as you are using it, you might possibly be able to use a smaller battery.
The solar panel does not need to supply enough power for continuous use, just enough to prolong the use, ie. using 2 amps playing and putting 1 amp back in at the same time. And the solar panel keeps working while you have a break.
Just a crazy thought that popped into my mind.

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