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ClemensValens vor 12 Stunden
Are you aware of the fact that the kind of pushbuttons shown in the photograph is typically rated for only 50 mA @ 24 V? In your circuit it has to pass the full (inrush) current to the Arduino, so you might want to choose a more suitable type. I modified the circuit to move the switch out of the power path, see V5 (attached). I added an LED too.
On/Off Button for Arduino; switching off software controlled
ClemensValens vor 16 Stunden
Looking once more at V3 I think an extra diode is needed to prevent voltage inversion passing through the body diode of Q1. See D1 in attached V4.
On/Off Button for Arduino; switching off software controlled
Sarbjit Singh Mal
Sarbjit Singh Mal vor 1 Tag
As per the circuit description,  voltage across Capacitor C15 will never go above VBE(sat)  i.e. Base to Emitter saturation voltage ( 1.0V) of transistors T7 & T8 (when Base to Emitter  diode will get forward bias) in case of positive  DC offset voltage more than  0.55 V ( for T8) or a negative DC offset greater than 0.85 V (for T7) at the output and almost entire offset voltage (less  1.0V VBE(sat)  of T7/T8) will appear across R23 (15kΩ) and current through R23 will be limited to approx. 3.67 mA { i.e. (56-1.0)/15000} in case of DC offset voltage swing to even up to +V or –V supply rail. Capacitor C15 is already shown as non-polar in the circuit schematic. Mal  
Q-Watt - Simple Audio Power Amplifier (110656)
Stacy Markel
Stacy Markel vor 1 Tag
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WebServer for Wide Area and Local Area Control & Monitoring
HaSch vor 1 Tag
Very nice! My Version 1 is tested and is working very well. Sure, you can use it with any MCU, maybe with a small PCB instead of the prototyping PCB I used.
On/Off Button for Arduino; switching off software controlled