Kit build: stereo amplifier.

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Remember that big box of kits that universal Solder sent me last month?
Here's the first build out of that collection.
This is a 15 watt stereo amplifier based on the TDA2030 amplifier chip.
More info on the kit :
universal-solder.ca/product/stereo-tda2030-audio-amplifier-diy-kit-with-tone-control-v1-1/
After asking Universal Solder about the component value changes, he tells me that it was a change to make the amplifier a bit more stable at high gain settings, as I suspected.
There were components included in the kit for both options.
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This isn't the only way to do it.
It's probably not the best way to do it.
But it's how I did it.

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Опубликовано:

1 мар 2024

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Комментарии : 47

@canaduino 4 месяца назад

About R8 and R9: The 100k were added at a later stage to achieve a higher gain. The kit was originally designed with the 33k and later updated without changing the PCB. Updating the schematic is much easier than a batch of 500 PCBs. The reason for the extra parts is that the parts for the kits were already picked for a different stage of the development, and parts replaced at a later stage were just added without removing the replaced parts from the kit. Nothing wrong with some extra parts, right?

@pileofstuff 4 месяца назад

Thanks for the clarification!

@stephendredge6077 4 месяца назад

According to the schematic C8 and C9 decouple the input bias network to the positive rail instead of ground. This must be a mistake. It will couple noise from the power supply into the 2030 input. Is error on the PCB as well?

@markfergerson2145 4 месяца назад

(third edit) They’re beefy electrolytics, so they shouldn’t pass much audible noise. Looks to me they’re there to hold that reference point solid.

@stephendredge6077 4 месяца назад

@@markfergerson2145 C1, C2, C10 and C11 ensure the power rail has a sufficiently low impedance at AC to allow for resistance and inductance in the power supply and cable. The capacitors will reduce but not eliminate power supply noise and ripple. The R10,R1 junction is set to be half the power rail voltage so the 2030 output is also half rail. AC wise it should be ground. C8 should therefore go from this junction to ground.

@canaduino 4 месяца назад

@@stephendredge6077You found the easter egg. C8 and C9 should better be connected to GND to avoid noise from the power supply. We will change this with the next revision.

@brettkaufman2299 4 месяца назад

I like your pointer stick! Also your channel. Thanks!

@canaduino 4 месяца назад

V1.2 with updated PCB and schematics is already in the works. Prototype PCBs have already arrived but still need to be assembled and tested. Watch for the version number change on the product page (currently V1.1). ETA March 8-12.

@frankowalker4662 4 месяца назад

I knew it would be a good build. I love analog amplifiers.

@johncoops6897 4 месяца назад

15:15 - thermal paste has left the chat 😂 - you should always add a thermal interface for components that require a heatsink.

@pileofstuff 4 месяца назад

I can always sneak some in there when i ge around to building a cabinet for this .

@johncoops6897 4 месяца назад

@@pileofstuff - BEWARE... also check the width of "ribs" on heatsink where TO-xxx package bolts down. I just repaired some electronic loads where the sides of the device package were tight against the ribs, so the screw didn't pull it down 100% flat onto the heatsink 😢

@canaduino 3 месяца назад

@@johncoops6897 The heat sinks in the kit fit the ICs just perfectly.

@johncoops6897 3 месяца назад

@@canaduino - My sarcasm detector was flashing, but it's always difficult to know when reading RU-vid replies 😉 . The heatsinks that I just fixed looked like they fitted the TO-xxx devices perfectly, however there was actually a tiny sliver of light visible on one side of the device where it had not pulled down properly. It was the exact same design of heatsink as shown in this video. I actually ground a small chamfer on the rear side edges of the device, and left the HS alone.

@canaduino 3 месяца назад

@@johncoops6897 The sarcasm detector! Let's make a kit 🙂

@Ernzt8 3 месяца назад

Maybe you can use the valve caps people keep sending you as keys

@lorisrobots 4 месяца назад

Great kit build - I am learning some nice techniques from watching you do these kits. Thanks for posting!

@jerril42 4 месяца назад

That was fun. I noticed the cool overhead shot from the swing cam and zoom during the resistor installation. Some fancy editing there. Nice kit, I've been looking at that amp, but I don't have a need for one right now. Thanks for the morning entertainment. Take care.

@DustinWatts 4 месяца назад

Not even December! What a treat :D

@Kae6502 4 месяца назад

4:25 Yes! Well done! :D That shot made my day. Cheers! 🍻

@onecircuit-as 4 месяца назад

Good build, very relaxing! 👍😀

@mr.makeit4037 4 месяца назад

Excellent job!

@iceberg789 4 месяца назад

looks neatly designed, but the tone control is passive only. i would have added a dual transistor preamp arrangement, which sounds a lot better. also the input coupling caps are 220nF only. pl upgrade then to 1uF box type non polar ones. no compromise.

@canaduino 3 месяца назад

Come on! This is a kit for solder-ironists to fight boring boredom on a winter weekend. The kit was never meant to compete with a NAD - hence the $15 price tag and the compromises.

@canaduino 3 месяца назад

The 220nF caps deliver 15Hz cut-off at 3dB. 1µF MKT caps would lower that to 3Hz and increase the price by 2 bucks. For what? If you have speakers that let you feel a difference between 3Hz and 15Hz, you would pump north of 1000W into them, but not 15W.

@Multi-Skill-Bill 4 месяца назад

That is a nice looking little kit. You made short work of it. How do you like that PCB holder? I just got one and haven't used it yet.

@pileofstuff 4 месяца назад

I spent a few months trying out a bunch of different board holders. This one turned out to be the one I kept coming back to after trying each of the others.

@Multi-Skill-Bill 4 месяца назад

@@pileofstuff Cool, I cant wait to try mine out. Kinda in the middle of a bench remodel :)

@erikburman530 4 месяца назад

What? No thermal paste?

@quandiy5164 4 месяца назад

I think your 3.5mm cable is fine. I didn't see you solder the ground pin on the input jack (not sure if it was soldered off camera) if it wasn't soldered, that can cause the humming when you move the input cable.

@pileofstuff 4 месяца назад

I tested this cable with another powered speaker - it's definitely the cable.

@mariushmedias 4 месяца назад

The heatsinks are not big enough to keep these cool if running at high output power. I would have liked to see bigger rings to allow for easier soldering on such project, seems like there's space to allow for that, would make soldering with shitty irons easier. Also, kind of a shame to see carbon film resistors, would have been nice to see better metal film resistors.. they're pennies when you buy boxes of 1000-5000 so you're not saving much by going with carbon film resistors. Would have been cool to have a sort of lead forming tool especially as it looks all resistor are same size, could easily 3d print something or have a bit of circuit board with half through holes on the edges to bend leads around board. I didn't see the mating connectors for the speaker headers put on the board, and those don't look like standard connectors ... and even if mating connectors are included do those need crimping the wires? Maybe use bog standard RCA or connectors where you screw wires into instead in a future revision?

@TheUnofficialMaker 4 месяца назад

aww, no smoke and bubbling plastic lol

@timidater4803 4 месяца назад

Where did you get your board holder? Thanks keep rockin!

@pileofstuff 4 месяца назад

Got it from ebay several years ago. Here's one of the many sellers: pileofstuff.ca/r/oan0y Feel free to use the words in the listing title to search fo ra less expensive one (or one with cheaper shipping to your country)

@timidater4803 4 месяца назад

Thanks man it's time to ramp up my guitar pedal builds!

@EsotericArctos 4 месяца назад

I am not sure I agree that modern components are more resilient. Sure, very very early (like 60's) transistors were fragile, but 70's/80's electronic components seem a lot more tolerant and robust than todays ones. It's like we have gone backwards because it's about making things as cheaply as possible now instead of making quality

@HazeAnderson 4 месяца назад

Maybe you could do a kit by starting with the physically largest, highest profile and most likely to get damaged components instead 😄as a challenge 😄for SCIENCE! 😄

@pileofstuff 4 месяца назад

😳 You really want to see me struggle! 🤣

@danman32 4 месяца назад

I'm not keen on how R11 was mounted. Not nice an flat.

@pileofstuff 4 месяца назад

Yeah, I didn't notice it until after I had trimmed the leads. Fortunately it has no impact on the function of the circuit.

@erikburman530 4 месяца назад

It's not good form to leave it up to the kit builder to figure out how to resolve discrepancies. If the circuit has been updated it would have been very easy to include a notice explaining the situation. -2 points. Unforced error!