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Pn2222 transistor bs1709/27/2023 ![]() Given below are the specifications of PN2222 and PN2222A transistors in a tabular form. E Emitter Current comes out of transistor through the emitter, usually grounded. C Collector Current flows through the collector, usually connected to a load. Is there a general Rule why and when to use a specific Type of Transistor i wanna learn something out of this problem so i dont have to annoy you guys here again.PN2222 Pinout Diagram Pin Name Description B Base Controls the transistor’s biasing, used to turn it on and off. Now a general Question came up as i read your answer. I dont realy know what to do with my measurement because i understood your message like the type of Transistor depends on the COM to GND Voltage. ![]() I wasnt able to measure any voltages form one of the pins to ground (i am probably to stupid to measure properly).īut i was able to measure the Voltage between the Ports which is 1.8V, as you said Ground has a higher potential. If this voltage is greater than 5V then you need an NPN transistor to drive the base of the PNP transistor up to this higher voltage first. If this is 5V or less you need to use a PNP transistor with emitter to com and collector to your play pin. You need first to measure the voltage on the com input with respect to ground. Your schematic is showing you trying to do this as if you needed to connect to com which was a ground. You need to connect the switch between com which is a positive voltage and the button, which will be a smaller voltage. If you have any question feel free to ask i am happy for every help i can get Ill attach the Manual of the specific Board (even if it isn't that informative) and the Datasheet of the CSR8645 if that helps. But that worked only to switch an LED on and of while i connected C to 5V and E to Ground (with a 220 Ohm resistor for the LED obviously) I had the improvised Idea of just taking a 100 Ohm Resistor to assure a Voltage<5V at the Base. ![]() What resistor should i use for the B-Port of the Transistor if C is Connected with the Play-Port and E with the COM Port? I am asking this because i wasn't able to measure any current flowing between the COM and e.g. ![]() Once i try to do the switching with the PN2222 Transistor nothing happens. This works fine while i am using only the switch. The switching should be done by connecting the relative port with the COM Port on the CSR-Board. I want to activate five NPN via the 5 digital Pins on my Arduino Nano depending on the pressed buttons. I can only use 3 switches because of the limitation of free slots in the middle console of my car. The Plan is to use only 3 switches for these 5 operations this is gonna be realized with an arduino nano with holding the buttons for different durations. The Module i chose has 5 switching options for Play/Pause Next/Prev Volume-Up-Volume-Down. I am currently trying to upgrade my car HiFi System with a CSR8645 Bluetooth module.
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