Thursday, 31 January 2019

Update on Digital Audio Siggen

I have made what I hope will be the last update to the Digital Audio Siggen. This is to use an LM386 as the output amplifier. I bought an amazing kit for £1.56 on eBay, a complete amplifier with gain control!!! So the schematic is now this:

ASG sch

If I decide to build this, I may do a PCB. This is the hard wired prototype.

IMG 0883

The output is up to a little above 10dBV up to 100kHz - pretty good for the LM386!

UPDATE

Later I found that 12V was too much for the LM386 I had an it blew up - seems you need a special version fo ruse at 12V and above. So I have removed the amplifier for now.

Code update here
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2 comments:

F1BFU said...

your articles are very interresting and the associated montages very affordable for novices

Cordially Antony

4 February 2019 at 22:25
F1BFU said...

Hi Antony

I think that by programming the choice of the waveform it must be possible to use a signal in sinusoidal, triangular or square wave.
SINE_WAVE = 0x2000
TRIANGLE_WAVE = 0x2002
SQUARE_WAVE = 0x2028
HALF_SQUARE_WAVE = 0x2020

4 February 2019 at 22:38

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