Db Technologies Cromo 12 amplifier no audio

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  • samson7point1@yahoo.com
    Help troubleshooting an audio problem with an RCA SGT-250 CED Player
    by samson7point1@yahoo.com
    The Problem: This player has a toggle switch to select between Stereo, Mono R, and Mono L. Regardless of the setting it outputs the sound to both the L&R audio jacks. In the Mono R position, the audio output level is normal (from both the L and R audio output jacks), in the Stereo position the audio output is about half the volume, and in Mono L, it's about 3/4 the volume. Something about putting it into Stereo mode is causing the volume to drop significantly and I can't figure it out.

    The player processes the audio signal using two different reference frequencies. The "R"...
    PW300S circuit diagram
    2 Photos
    04-30-2024, 11:22 AM
  • silver60618
    Macbook M3 A2991 Speaker Audio Amplifier IC
    by silver60618
    Im working on a 2023 Macbook Pro M3 A2991, that had a liquid spill, has no sound. Corrosion found near Speaker Audio Amp IC. Chip ID SN012776B0,
    I did find a SN012776B0 on A2442 model, but the sub and replaced it, no go. Anyone know if these audio amp IC's are cross compatible between 2021-2023 models?...
    09-26-2025, 12:25 PM
  • eccerr0r
    Frying amplifier finals... audio, not rf...
    by eccerr0r
    Well for RF transmitters, transmitting without an impedance matched antenna and if the transmitter doesn't have automatic limiting... kiss the final transistor goodbye and chalk one up to something you killed.

    But that's not the same way with audio amps for the most part, well, at least the wavelength of audio on copper is so long that you get all of it back anyway but the transistor is fine with it...

    So how are people destroying finals in their audio amplifiers then? Heh.

    Are people shorting their outputs or something, overdriving output to a too big speaker?...
    11-27-2021, 12:30 AM
  • Babbar
    Argon SA1 audio amplifier power-supply - fuse blown after fixing the short?
    by Babbar
    I found a project in the electronics trash yesterday. A nice Argon SA1 audio amp with some electrical issue. Took it apart and saw that the 4A250V fuse was blown so started lifting components to find the short. Eventually got to two MOSFETs (model FTA14N50C) that are shorted and when i took them out the short was gone.

    Now i didn't have any replacements of the same model of course but i found a couple with pretty similar spec i thought (K10A60D & K12A50D) and put them in. Also replaced the blown fuse with a 3.5A250V one. Checked another time for short circuit and plugged it in....
    04-12-2024, 01:12 AM
  • MrCommunistGen
    Polk Audio RTi100 Plate Amplifier won't power on and intermittently honks and buzzes
    by MrCommunistGen
    My childhood best friend was killed about 9 years ago. His parents are finally letting go of his things, and they offered me his Polk RTi100 tower speakers. The Polk RTi100 towers are one of a handful of designs from the early 2000s that is a full range 3-way tower with a built-in self-powered subwoofer. This is accomplished with a plate amp integrated into the speaker input panel.

    I think they used them for a while, but they've been sitting for at least a few years now. After about 40 hours of driving to their house and back (both they and I have moved in the last 9 years) I got...
    07-12-2021, 05:11 PM
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