ESP8266 Community Forum

I had a similar problem a while back, weak signal from the output pin had to be boosted (it was an analog signal too, iirc, from a DAC). Someone recommended I use an op-amp setup to boost the signal, and it worked a treat!

I still have the unit, built it easily with just one chip, a 4-op amp LM324 jobbie.

By the way, like yourself, I am more of a programmer, and know very little about electronics. So if I could do it, you probably could, too. The design is something like this: http://www.eleccircuit.com/increase-out ... 85ma-size/

Only thing I'm not sure is if the 85mA output is enough for you.

Why does the diode go across the coil and not between the coil and transistor?
Where did you find that wonderful Datasheet? Are there more?
can anyone suggest a class/YouTube to that covers (Best Practice).

The diode is placed across the coil to give the inductor current a path when the transistor is OFF (open).

I found the datasheet here: http://rabbitmax.com/files/SONGLE-SRD-05VDC-SL-C.pdf

alex_g wrote:I had a similar problem a while back, weak signal from the output pin had to be boosted (it was an analog signal too, iirc, from a DAC). Someone recommended I use an op-amp setup to boost the signal, and it worked a treat!

I still have the unit, built it easily with just one chip, a 4-op amp LM324 jobbie.

By the way, like yourself, I am more of a programmer, and know very little about electronics. So if I could do it, you probably could, too. The design is something like this: http://www.eleccircuit.com/increase-out ... 85ma-size/

Only thing I'm not sure is if the 85mA output is enough for you.

Thanks, it is so interesting just how many ways there are to do the same thing.
I took yesterday off, and spend the day on YouTube transistors theory. The Math is impressive.