Holy cow 🐄🐮

Seeing the difference between LED and incandescent bulbs

  

Ok nm I didn't realize there were different models 

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Instructions for the one I have

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Working in single phase mode

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Finally got around to trying this thing

I splurged a few bucks on a manual

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I hooked it to a box fan 

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So it has life but I couldn't get any response from the single phase mode aside from a small reverse movement I did reverse polarity to try it to no avail

I don't see any fuses anywhere on the unit or in the manual nor a power cord 

I need to calculate approximate watts of a dollar store box fan 

Thanks
I guess it would help if I looked it up and determined what actually happens circuit wise with a standby switch  like it shorts out the flux capacitor 

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I had the floor preamp version of this (RG13) and it is a great preamp.  I'm working up a PCB for just the preamp currently, which I'll share for feedback soon.

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Personally, __I__ would flip the power switch first and the standby switch later on, if at all.

I'm doing lots of the same stuff over and over with resistors capacitaters and inductors 

I've been impressed with this hobby that experimental results closely match calculations.

However I'm wondering if there is a limit to how accurately my multimeter can measure ac voltage ⚡ drops (rms) at different frequencies....like 20 khz

Oh well I guess that's why we have oscilloscopes (Vp-p)

Or bench multimeters ? 

I'm sure it would be cool 😎 to have a bench meter but I certainly don't need voltage to twenty decimal places or a real earth ground (thanks G1  )

Hey guys

What about shutdown at end of playing ?

Power off or standby for a while then power off 

Quote from: joecool85 on January 08, 2025, 06:16:33 PM... it does no harm.

A lot depends on the user, I guess. Most people probably use a standby switch sparingly, so it does no harm whatsoever, but I know one person (in person) who used to leave his 50-watt all-tube amp on standby for extended periods (over an hour)... According to Merlin's article which I linked, it's bad practice and can have a detrimental effect on tubes.

Personally, I haven't put a standby switch on my tube amps for years now.

Quote from: Loudthud on January 08, 2025, 07:56:04 PMSorry for the delay but here's what I got from my guy at TI. He's not an actual employee as far as I know, more of a paid consultant. The TI engineers are talking about those designs where you use two chips in parallel or two chips in a bridge drive configuration. I think Marshall has a design that uses four chips for amp. Hard to keep working blowing up chips all the tome.

Yea LM3886 is back in stock. I've printed a few PCB batches
for a guitar and Bass power amps to build with them but after
talking with TI engineers they steered me away from them to
use Class D. I've yet to build any amps with the LM3886.  They
pretty much implied it was designed for single module application
or dual in stereo and not recommended for multi modules designs
to double the power. They said rail voltages needed to achieve the
result I expected would exceed the maximum continuous voltage
and cause them to fail. So I get they exaggerated the true power
output and adding additional chips don't increase total power
output in expected quantities. They also exaggerate about the
Class D chips. In reality the advertised output is at 2 ohms and
maximum rail voltages before it burns!! So if you want 200 watts
in the real world you must get 700watts to come close.

I think a single LM3886 chip amp at 50-ish watts would be plenty for a guitar amp.
Especially if it's going through a 2x12 or 4x12

I think it would be better to use class d for bass amps.

If the TI chips can't really achieve their listed wattage, I bet the ICEPower modules can.

There are other options too.