How do I select values for R5, R6, and R7, thank you!
Power supply 5V transistor 8050 8550, R8 must flow 200ma, delay 3 seconds, I don’t know how to calculate the resistance?
Garrett Posted on November 23, 2020
Isn't the value already taken in the picture? 1K.
Phoebe Posted on November 23, 2020
It is designed according to the power supply voltage and the parameters of the selected triode.
Giovanni Posted on November 23, 2020
The delay circuit needs to be designed with the capacitor charging coefficient. The current limiting resistor increases the capacitor and the capacitor increases. The formula is here: charging time T=RCln((U-Uc)/U),
