Loftech TS-1 Schematics

This is where we talk about testing, measuring and repairing things. Sometimes we have to repair the equipment we use to test, measure and repair other things. It's an endless cycle of fixing the broken things we need to fix other broken things.
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JR.
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Re: Loftech TS-1 Schematics

Post by JR. » Sun Nov 26, 2017 11:50 am

I found a nice back lit LCD display with 16, 1/2" high characters... not cheap (>$20) but with 16 characters I can display decibel level and frequency at same time.
Image

There are cheaper displays but with much smaller characters. The only cheap/large character LCD was 4 digit clock display....

JR

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JR.
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Re: Loftech TS-1 Schematics

Post by JR. » Sun Nov 26, 2017 2:52 pm

This is fun thinking about this....

I could use a 16B DSPic that has 2x16b DAC built in, but only 12 bit A/D built in... Or in the $3-$4 range I can get a 24b stereo in/stereo out codec... that I can hang on a cheaper micro...

Probably use a DPOT to pad scale the input range down to the 3V codec.

Now that is probably more bits and I/O than I need, but why scrimp?

I need to soak this in beer tonight. 8-)

JR

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mediatechnology
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Re: Loftech TS-1 Schematics

Post by mediatechnology » Sun Nov 26, 2017 5:06 pm

After soaking it in beer you might want to start a thread in the Design area of the forum. I'm liking this.

Other than the analog front end for the measurement A/D and the balanced output there doesn't seem like much additional outboard circuitry would be required.

Rather than a DPOT you might consider a resistive pad since the DPOTs THD would limit you if you ever wanted to use the same engine to perform THD measurement. You would want a low distortion coarse output pad too wouldn't you?

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JR.
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Re: Loftech TS-1 Schematics

Post by JR. » Mon Nov 27, 2017 11:27 am

Wayne can you split this topic and move this veer to another forum?

Moderators should have that capability.

If not I will start another.

JR

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mediatechnology
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Re: Loftech TS-1 Schematics

Post by mediatechnology » Mon Nov 27, 2017 12:00 pm

I will move that. Not something I do often so I have to remember.

What shall we call it?

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JR.
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Re: Loftech TS-1 Schematics

Post by JR. » Mon Nov 27, 2017 12:09 pm

TS-too.... TS-1 revisit

JR

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mediatechnology
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Re: Loftech TS-1 Schematics

Post by mediatechnology » Mon Nov 27, 2017 12:13 pm


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