ESP8266 Community Forum

- Thu Jan 12, 2017 3:40 am #60874 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.

- Thu Jan 12, 2017 10:47 am #60899 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).

- Thu Jan 12, 2017 7:04 pm #60929 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

- Fri Jan 13, 2017 8:58 am #60950

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.