Why did it stop working in the car where there was no limiting?
As a side note, flyback power supplies in car amps can draw a huge amount of startup current. I don't remember pulsing helping when current is limited (like it can for push-pull supplies) but it may work for some.
As a side note, flyback power supplies in car amps can draw a huge amount of startup current. I don't remember pulsing helping when current is limited (like it can for push-pull supplies) but it may work for some.
It was never connected in car, I was testing rebuilt subwoofers on my home ghetto setup 12v100amp/Battery (which I’ve since replaced with proper/safer PS) and while switching subs I accidentally pulled on speaker leads from amp causing them to touch&spark. I immediately killed power, ordered a proper PSU and when it got in I limited current to 2a and it would only pull 3v/2a+ (CC mode, with it drawing that low volts/high amps my limited knowledge had me thinking it was damaged, no idea it was a flyback needing more current to properly boot) ya def a “learned the hard way” experience 😅
Todd at Ellensburg suggested I pulse the remote and it kicked on, so I tried giving it more amps from onset and it booted right up, reinstalled everything and it works fine. I was just worried giving it more then 2a would damage it even more ...what a newb mistake, I can be way over cautious at times.
Todd at Ellensburg suggested I pulse the remote and it kicked on, so I tried giving it more amps from onset and it booted right up, reinstalled everything and it works fine. I was just worried giving it more then 2a would damage it even more ...what a newb mistake, I can be way over cautious at times.
Ahh ok, So just to make sure, what would I set PS Max current at with that resistor between PS positive lead and Amp positive terminal? My max on this unit is 10a, just set to max and cut it once I notice amp is drawing excessive current after initial power on? I usually test with 12v/2a, I’m actually wanting to order an isolated power supply with built in cut off protection as well just for testing to protect my Oscope, still grasping proper grounding as well but I always use main amp negative terminal, thoughts on isolated PS?
As for the signal source with a grounded shield, what/how is that? I’m about to research after posting this, I usually use a mock up of a 12v car environment with a prioneer Car headunit for a signal but I also have an arbitrary wave generator on my Oscilloscope, Hantek DSO2D15 (still learning it) and would like to use that if possible, less setup. Would that work as a shield grounded signal source?
Thx for all the advice and insight Perry 🖖🏼
As for the signal source with a grounded shield, what/how is that? I’m about to research after posting this, I usually use a mock up of a 12v car environment with a prioneer Car headunit for a signal but I also have an arbitrary wave generator on my Oscilloscope, Hantek DSO2D15 (still learning it) and would like to use that if possible, less setup. Would that work as a shield grounded signal source?
Thx for all the advice and insight Perry 🖖🏼
What do you mean by 'isolated power supply'?
And why to protect your scope?
If you have a pioneer head unit and you connect it's ground terminal to the ground terminal of the 12v power supply that's powering the amp, that will give you a signal source with a grounded shield unless the shield ground in the pioneer is open.
And why to protect your scope?
If you have a pioneer head unit and you connect it's ground terminal to the ground terminal of the 12v power supply that's powering the amp, that will give you a signal source with a grounded shield unless the shield ground in the pioneer is open.
Ahh ok, so just stick with my Pioneer head unit 🙂 is the scope AWG a possible grounded source as well or just stick with headunit?
And when watching some videos on oscilloscopes and amp repairs a few on Oscope vids stated how grounding was important, and the hazards and possible damage if not grounded correctly, some recommending isolating the power supply of the scope to prevent damage and some vids of amp repair expressly stated they used isolated power supplies for testing/repairing amps as they are 2 prong and not earth main grounded so less chance of damage happening when probing certain components with your oscilloscope I guess.
I always use main amp negative terminal as scope ground, which is always connected to the negative lead on power supply. PS does use a 3 prong plug and it has a front terminal for main earth ground (green) but I’ve never used it, I only use positive(red) and negative(black) terminals when testing/benching amps.
Kungber SPPS-S3010 power supply
Edit: actually I just realized, if my PS has a separate terminal for earth main ground doesn’t that mean the negative terminal is floating/isolated? I’m going to research online and check.
And when watching some videos on oscilloscopes and amp repairs a few on Oscope vids stated how grounding was important, and the hazards and possible damage if not grounded correctly, some recommending isolating the power supply of the scope to prevent damage and some vids of amp repair expressly stated they used isolated power supplies for testing/repairing amps as they are 2 prong and not earth main grounded so less chance of damage happening when probing certain components with your oscilloscope I guess.
I always use main amp negative terminal as scope ground, which is always connected to the negative lead on power supply. PS does use a 3 prong plug and it has a front terminal for main earth ground (green) but I’ve never used it, I only use positive(red) and negative(black) terminals when testing/benching amps.
Kungber SPPS-S3010 power supply
Edit: actually I just realized, if my PS has a separate terminal for earth main ground doesn’t that mean the negative terminal is floating/isolated? I’m going to research online and check.
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Scopes and power supplies are typically grounded to the mains ground. That's how it should be. Don't float anything (not event the power supply).
Learn to use your scope in differential mode. I don't know how many people would buy a multimeter that could only measure voltage with the black probe on ground. That's the limitation you have when people don't learn ti use differential mode.
The scope and the PS will ground through the mains plug but it may be a bit better for both to connect the scope ground to the power supply's negative terminal.
Learn to use your scope in differential mode. I don't know how many people would buy a multimeter that could only measure voltage with the black probe on ground. That's the limitation you have when people don't learn ti use differential mode.
The scope and the PS will ground through the mains plug but it may be a bit better for both to connect the scope ground to the power supply's negative terminal.