![]() ![]() There's a lot of differing information and I want to get it right. I realise the photo isn't amazing so I've listed all the components I can read.Ĭould someone check my list of parts and replacements. It wouldn't even ID it, just said 'Micro not supported.' So I guess I need to re-work it. However, if you use the P-channel MOSfet, a high-impedance GPIO pin will give you undefined power to U-blox, so in this case, the PNP transistor might be safer.FGTech Galletto 4 Master clone: Which component should be changedįGTECH 4 Chinese 386 clone failed to BDM an EDC16C31 from a Mercedes Sprinter today. A 2N3904 in a TO-92 package on a breadboard (lower left). While the GPIO pin is high-impedance (tri-stated), the U-blox module will be inactive (off). A 2N3904 made by Motorola.The pinout from left to right is: Emitter, Base, Collector. To turn it off, GPIO is driven to logic HIGH. Technical Information - Motorola Semiconductor 2N3904 Datasheet. Quick jump to: 1N 2N 2SA 2SC 74 AD BA BC BD BF BU CXA HCF IRF KA KIA LA LM MC NE ST STK TDA TL UA. You won't need a base-resistor (0 ohms) in this case.īe aware that the GPIO switch logic is reversed with PNP high-side switch (same with P-channel MOSfet switch): To get your U-blox 6M powered up, the microcontroller GPIO pin is driven to logic LOW. 3904 B331 datasheet, 3904 B331 pdf, 3904 B331 data sheet, datasheet, data sheet, pdf. The flash rate can be adjusted by changing the value of the 1K resistor used in the circuit. The circuit uses a single transistor as a driver which takes a flash rate from the 2nd LED which is a self-flashing LED. The saturation voltage in this case is far less than the NPN switch, and it won't get quite so hot.Įven better: Use a P-channel MOSfet having logic-level gate threshold voltage. Pin Configuration 2N5401 has three pins like any other transistor namely EMITTER, BASE and COLLECTOR. Quick jump to: 1N 2N 2SA 2SC 74 AD BA BC BD BF BU CXA HCF IRF KA KIA LA LM MC NE ST STK TDA TL UA: Up1 : LM317 LM339 MAX232 NE555 LM324 7805 2N3055 LM358 2N2222 74LS138 TDA7294 TL431 IRF540 1N4148 74LS11: Up2 : 2N3904 datasheet. Working Explanation The above circuit is a simple single transistor LED flasher circuit which will flash a super bright LED. It is widely used for low power amplification and switching. The transistor switch has too much voltage drop when the GPIO pin goes high.even when you reduce R1 to zero ohms.Īnd if your GPS module really pulls 100mA current into its +supply pin, use a bigger transistor that can handle more current PN2907, 2N4403 or equivalent. 2N3904 Transistor is a popular NPN bipolar junction transistor used in low power and current, medium voltage applications. Simulate this circuit – Schematic created using CircuitLab Unless my 2N3904/B331 and 2N3906/B331 pinouts are backwards, of course. Control U-blox +supply pin with an NPN transistor? I can only envision one way to do this: ![]()
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