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October 27, 2021, 12:23:28 AM

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21
The Newcomer's Forum / Re: Busking Amp for Bass & Vocals
« Last post by Tassieviking 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.
22
The Newcomer's Forum / Re: Busking Amp for Bass & Vocals
« Last post by Tassieviking 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.
23
The Newcomer's Forum / Re: Busking Amp for Bass & Vocals
« Last post by Tassieviking on October 12, 2021, 09:28:00 AM »
Another small amp module I think might be good is the TPA3116D2, very cheap on Ebay ($8 up).
In stereo at 12 volts it can go up to 15 watts per channel into 4 ohm speakers.
If you needed more power you could use 2 x 12 volts batteries for 24 volts, then you can get 60 watts per channel into 4 ohm speakers
If you do go with a stereo amp module you could run one channel Bass amp and one for voice / guitar, 2 different speakers.
The TPA3116 can run on 4.5 volts to 26 volts.
I have 2 100 watt mono  modules I bought ages ago, they are small enough to fit into a 1590B stomp box, I was thinking of using one with a laptop power supply for a small pedal amp.
I think that would go nicely with the Sunn Beta preamp pedal I made.
24
Amplifier Discussion / Re: Sunn SL260 Help Needed With Pot Orientation
« Last post by Tassieviking on October 12, 2021, 08:52:51 AM »
Thank you LoudThud for that information.
I don't suppose you would know the Dual Pot orientation in the variable frequency circuit for the Mid control, If I can't find out I could just leave the viper (leg2) disconnected, and then short it to the correct leg after i build it. The viper (leg2) has to be shorted to leg 1 or 3 of the pot.
Even better if someone could identify what kind of circuit it is so I can do some research on it, it has to be some kind of active notch filter I presume.
Again, thanks LoudThud for your help.
Michael
25
Amplifier Discussion / Re: Sunn SL260 Help Needed With Pot Orientation
« Last post by Loudthud on October 10, 2021, 04:08:27 PM »
Pin 3 of your pot symbol appears to be the clockwise terminal, therefore, the Mid, Treble and Bass controls are backwards.
26
Amplifier Discussion / Re: First attempt to do upgrade
« Last post by Jazz P Bass on October 10, 2021, 12:21:05 PM »
From the Web: "Made in the sixties for film editing, this little squawk box amp is all kinds of fuzzy fun. You can play straight into the amp through its rattly tiny speaker, or use the headphone jack to run it into another amp …"
27
Amplifier Discussion / Sunn SL260 Help Needed With Pot Orientation
« Last post by Tassieviking 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
28
The Newcomer's Forum / Re: Busking Amp for Bass & Vocals
« Last post by joecool85 on October 09, 2021, 07:12:49 PM »
Looks like a class D amp would be up your ally.  I've been eye-balling this circuit for a while:https://www.parts-express.com/Sure-AA-AK32151-2x15W-Class-D-Stereo-Power-Amp-Kit-TPA3122-320-322
29
Amplifier Discussion / Re: First attempt to do upgrade
« Last post by joecool85 on October 09, 2021, 07:10:13 PM »

      I posted this in wrong forum sorry for that
       Could someone move this to beginner forum

          Thanks

No need to move this post, we're pretty loose on what goes in which section - chill place around here.

For us to help you in any meaningful way, we're going to need some pictures of the inside of this little guy.  I've never seen anything quite like it, so not sure where to even start.  My guess is you would need to build a basic preamp to sit in front of this amp, then you would start to get more of a "guitar amp" sound from it.
30
Amplifier Discussion / Re: First attempt to do upgrade
« Last post by Madamp on October 09, 2021, 08:24:33 AM »

      I posted this in wrong forum sorry for that
       Could someone move this to beginner forum

          Thanks
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