Analog output with FREQOUT

Wolfbrother

Hello all,

I have a pretty simple circuit (same as shown in Basic Stamp command reference) feeding a NXP semi TDA7056. I'm using the sample circuit there. ·No matter what I do, this circuit buzzes terribly ( assuming this is the PWM noise to generate the sine wave) . I have even tried a voltage divider with a pot to make sure I am not saturating the amp and getting some other issue. Has anyone gotten a good audio tone with an amplifier?

I also tried a direct piezo buzzer on the output, I get a consistent tone with that, but not enough volume.

Thanks.

PJAllen

I've had acceptable volume without an amp, by using an audio transformer.· But you're probably more on about sine purity, etc.· Sounded OK to me, doing "FREQOUT music".· Maybe this'll couple to your amp better?

Wolfbrother

Hey thanks, I will try it. You are right about what I am looking for. If I can't get a good tone maybe I will interface to a good synthesizer chip. I just need to finish this soon, it's going in an art show in a week and half and I'd hate it to be on a breadboard in a show....