ESP8266 Community Forum

- Sat Aug 19, 2017 3:39 am #69267 yes, now everything is OK tnx

MY GITHUB: https://github.com/reaper7/

SDM Energy Meter: https://github.com/reaper7/SDM_Energy_Meter
MLEDScroll (TM1640 led matrix): https://github.com/reaper7/MLEDScroll

- Tue Jan 30, 2018 6:41 pm #73590 I am trying out the Software N DAC option based on the NPN 2N 3904 transistor.

When doing it according to the github page instructions, the esp8266 crashes with a stacktrace - see details at this github issue : https://github.com/earlephilhower/ESP82 ... /issues/42

Any ideas why this is not working? There is a second issue reporting the same problem also!

- Wed Jan 31, 2018 8:37 am #73606 It's a very bad connection. There is no resistor at the base of the transistor (around 270ohms) and the speaker should have a higher impedance.
The esp8266 output is essentially shorted to ground and the speaker may also overload the USB source.

- Wed Jan 31, 2018 9:24 am #73609 Hi,

Are you saying I need a 270 ohm resistor on base?
I am powering the speaker from an external 5v supply, not usb.