C'mon... 34-Cent Stereo Amp 2x3W? 29-Cent Battery Savior?

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  • My Russian electronics purchases have been limited to things like:

    *ferrite cores
    *seven-segment incandescent displays
    *wound paper capacitors
    *low-esr pulse discharge capacitors

    They were all serviceable. No rip-offs. No junk.
    Platåberget
  • I was wondering where you could find batting - thought about ripping open an old pillow.


    We have a furniture manufacturing company nearby called "Norwalk Furniture", they sell big bags of remnant batting for a couple of bucks, some large pieces involved, maybe you have something similar near you.
  • User Name wrote: »
    My Russian electronics purchases have been limited to things like:

    *ferrite cores
    *seven-segment incandescent displays
    *wound paper capacitors
    *low-esr pulse discharge capacitors

    They were all serviceable. No rip-offs. No junk.

    Don't know if it's still the case, but they also made some pretty good RF power tubes a few years ago. Used to buy them for the 1.5KW and 3KW rf generators used on the ICP spectrometers.
    In science there is no authority. There is only experiment.
    Life is unpredictable. Eat dessert first.
  • Try some batting in that enclosure. In an odd counter-intuitive way, the batting actually increases the apparent space of the enclosure as "seen" by the drivers, and you get a better sound (at least in the midrange, which is what those speakers are built for).

    Though fiberglass is better, you can use white polyfill from Joann's -- costs something like a buck for a sheet, and you'll only need one sheet to try it out. Worth a shot for the non-ported cabinet you've made (without a CNC...).

    Got some poly fill at Hobby Lobby. It seems like it sounds a little bit better and lessens distortion at higher volume

  • Hey Erco!
    Would you sell me one of these amps? I have no use for 10 of them but really could use one or two.
    Jim
  • RS_Jim wrote: »
    Hey Erco!
    Would you sell me one of these amps? I have no use for 10 of them but really could use one or two.
    Jim

    Sure, PM me your address.

    "When you make a thing, a thing that is new, it is so complicated making it that it is bound to be ugly. But those that make it after you, they don’t have to worry about making it. And they can make it pretty, and so everybody can like it when others make it after you."

    - Pablo Picasso
  • Thanks,
    Check Messages
    Jim
  • @Jim: Two going out in today's mail. Enjoy and get amped!
    "When you make a thing, a thing that is new, it is so complicated making it that it is bound to be ugly. But those that make it after you, they don’t have to worry about making it. And they can make it pretty, and so everybody can like it when others make it after you."

    - Pablo Picasso

  • 2x3W isn't going to cut it for me on my radio/RPi streamer.

    This seems like a decent deal:
    http://www.ebay.com/itm/1pc-PAM8610-2-15W-Dual-Channel-Stereo-Class-D-Amplifier-Board-12V-/272318922517?hash=item3f6778ff15:g:CaMAAOSw-YVXlfqz

    1pc PAM8610 2*15W Dual Channel Stereo Class D Amplifier Board 12V $2.59

    Would this be of similar output quality to the one Erco mentioned as OP, better, worse?

    This'll probably be my workshop machine, so I don't need audiophile quality, however for a buck or two more I'd spring for something of better quality.
    ---- This space available for rent ----<br>
  • Ron CzapalaRon Czapala Posts: 2,364
    edited July 2016 Vote Up0Vote Down
    koehler wrote: »
    2x3W isn't going to cut it for me on my radio/RPi streamer.

    This seems like a decent deal:
    http://www.ebay.com/itm/1pc-PAM8610-2-15W-Dual-Channel-Stereo-Class-D-Amplifier-Board-12V-/272318922517?hash=item3f6778ff15:g:CaMAAOSw-YVXlfqz

    1pc PAM8610 2*15W Dual Channel Stereo Class D Amplifier Board 12V $2.59

    Would this be of similar output quality to the one Erco mentioned as OP, better, worse?

    This'll probably be my workshop machine, so I don't need audiophile quality, however for a buck or two more I'd spring for something of better quality.

    This datasheet says the PAM8610 is 10W at 8 ohms- the eBay description says 15W at 24 ohms but still sounds like a good deal!
    http://www.datasheetspdf.com/PDF/PAM8610/642172/1

    Also says it has "32 steps DC volume control has a +32dB to -75dB range". I wonder what this board does with the volume pin...
  • Ron CzapalaRon Czapala Posts: 2,364
    edited July 2016 Vote Up0Vote Down
    Here is another PAM6810 board with a volume control, power jack, 3.5mm input jack and speaker terminals for $5.21

    http://www.ebay.com/itm/311602010347

    A similar one with a heatsink

    http://www.ebay.com/itm/291792721354
  • Here is another PAM6810 board with a volume control, power jack, 3.5mm input jack and speaker terminals for $5.21

    http://www.ebay.com/itm/311602010347

    A similar one with a heatsink

    http://www.ebay.com/itm/291792721354





    Well documented.
  • Thanks, since I am looking at upgrading power, considering one of the 2020a Class T now.

    But they're $20, so Off-Topic...
    ---- This space available for rent ----<br>
  • Has anyone had any luck with getting erco's original units to work? I soldered 1/2" wires into each f the holes so that I could put them onto a breadboard, supplied power from a USB port connected an 8 ohm speaker, and no joy. Today I will pick up a 1/8" jack at work and try an aux cord from my phone and see if that works. any other suggestions?
    Jim
  • RS_Jim wrote: »
    Has anyone had any luck with getting erco's original units to work? I soldered 1/2" wires into each f the holes so that I could put them onto a breadboard, supplied power from a USB port connected an 8 ohm speaker, and no joy. Today I will pick up a 1/8" jack at work and try an aux cord from my phone and see if that works. any other suggestions?
    Jim
    You said you connected an 8 ohm speaker (singular) - I hope you didn't connect the left and right channels together - you can't even connect the speaker negatives together as a common ground. I think it will damage the amp...

  • I wired up three boards and they all work perfect - I used an in-line stereo jack here:

    Class%20D%20amp.jpg
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  • Ok,I had 2 issues, 1 power supply related and 1 bad speaker. Fixed power supply problem and tried new speakers. They work great. I am a little suprised at how much drive they seem to need. Ran them off of an old cell phone running Pandora from wifi. Phone indicated volume in the danger zone for headphones.
    Jim
  • Here's a 10-cent 4-tone "alarm" chip (10 fer 99 cents shipped!) for anyone who can't figure out what to amplify with their 34-cent amplifier:

    http://www.ebay.com/itm/10PCS-KD9561-CK9561-Alarm-Chip-Four-Alarm-Tones-Chip/191106113304

    Doesn't even say what it is, but I found more info at

    http://www.ebay.com/itm/Voice-Module-KD9561-CK9561-Alarm-Module-4-Kind-of-Sound-DIY-Kit-/381754558228?hash=item58e2584714:g:J8EAAOSwaB5XphJ9

    Gotta be the same cheesy beepy 8-bit sounds we've heard in cheap toys since 1980.

    At that price, every project we build should include one!

    Alarm.png
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    "When you make a thing, a thing that is new, it is so complicated making it that it is bound to be ugly. But those that make it after you, they don’t have to worry about making it. And they can make it pretty, and so everybody can like it when others make it after you."

    - Pablo Picasso
  • Just got me 10 amplifiers. Your bad erco, but at 2.80 I can play!
  • ercoerco Posts: 17,936
    edited September 2016 Vote Up0Vote Down
    Shawn Lowe wrote: »
    Just got me 10 amplifiers. Your bad erco, but at 2.80 I can play!

    There's one born every second! Welcome to my hoarder's club. We have another forum for self-help and self-control.

    NOW THIS MUST BE A TYPO: Shawn made me look for a better deal (did he really get ten for $2.80?) and I found THIS:

    10 pieces amp with volume control for $1 ($1.29 can)! Likely they meant 1 piece, but I ordered one just to see. Still a bargain at $1 with that volume control!

    http://www.ebay.com/itm/10PCS-PAM8403-5V-Power-Audio-Amplifier-Board-2-Channel-3W-W-Volume-Control-/142101024643

    Edit: I just emailed the seller through Ebay for confirmation on that qty 10, so if it's a mistake he may change the listing. IOW, order now! :)

    PAM8403.jpg
    500 x 500 - 32K
    "When you make a thing, a thing that is new, it is so complicated making it that it is bound to be ugly. But those that make it after you, they don’t have to worry about making it. And they can make it pretty, and so everybody can like it when others make it after you."

    - Pablo Picasso
  • I've used the PAM 8403 amps (the red ones you can see on some ebay listings) on a couple of projects. They're surprisingly good for the price.
    San Mateo, CA
  • ercoerco Posts: 17,936
    edited May 2 Vote Up0Vote Down
    Dollar Tree has these amplified speaker balls for a buck (duh) in their hardware section. Roughly baseball-sized, flat bottom, 2xAAA batteries, nice old-school 1-7/8" steel frame PM speaker. Certainly not Veho quality nor hi-fi but plenty good enough for many projects. A fair amount of room inside for some extra gizmos & circuitry. 3.5mm input jack, no cable. Amplifier chip stamped LM4871, which if authentic is a decent chip from TI: http://www.ti.com/lit/ds/symlink/lm4871.pdf

    I only bought one today but I'll hoard a few more next trip.
    847 x 918 - 106K
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    "When you make a thing, a thing that is new, it is so complicated making it that it is bound to be ugly. But those that make it after you, they don’t have to worry about making it. And they can make it pretty, and so everybody can like it when others make it after you."

    - Pablo Picasso
  • ercoerco Posts: 17,936
    Even better is this Veho semi-clone at 99 cent stores. The "bomb speaker" by Vibe Sound. Internal rechargeable battery. Comes with USB charge cable, unusual small diameter coaxial plug. Works fine, I'm going to build one inside a robot project with an MP3 player.


    1550 x 1000 - 363K
    "When you make a thing, a thing that is new, it is so complicated making it that it is bound to be ugly. But those that make it after you, they don’t have to worry about making it. And they can make it pretty, and so everybody can like it when others make it after you."

    - Pablo Picasso
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