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"...
    04-30-2024, 11:22 AM
  • 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
  • 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
  • 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
  • RetroComputingGrotto
    TDA2030A Audio Power Amplifier Question
    by RetroComputingGrotto
    My boss always says "the only stupid question is the one not asked" so at the risk of asking a stupid/obvious question I'm going to one any way...

    I've got a pair of speakers with an amp built in to them in for repair and on inspection I can see the TDA2030A amplifier ICs have blown (so I've ordered some spares which should arrive soon):



    My quesion is with regards to the white paste you can see on the TDA2030A and heatsink, I'm assuming this is just some thermal paste and if so is it a special kind or will the grey thermal compound that I have...
    10-29-2024, 08:25 AM
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