Loftech TS-1 Schematics

[JR.]

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.


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

JR

[JR.]

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.

JR

[mediatechnology]

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?

[JR.]

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

[mediatechnology]

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

What shall we call it?

[JR.]

TS-too.... TS-1 revisit

JR

[mediatechnology]

Here ya go: viewtopic.php?f=6&t=918