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Trying to find what this IC’s do. At first i thought it was some kind of vreg but it doesn’t seem to be the case in terms of measuring the voltage as all the pins.
These little chips are connected tranxistor around the power source with a couple of resistors and capacitors. I can take a pic and upload it if it helps. Any hep you can give me will be greatly appreciative, thanks.
With resistors and capacitors they can form a kind of oscillator to drive a piezo buzzer, speaker, LEDs It would be very helpful to tell us what is the purpose of this circuit, and what are the other devices around it.
Also the picture would give more details. D There is 4 buttons, when off the only thing getting power 9V batt is a couple of these ICs and that it. When you push the on button the power is transfer to the transisyor of the componets such as 4v reg and a 3.
Here is a pic of the device side. As you can see these 3 pin devices are in the bottom left. This site suggests Philips BAV99 dual diode: The “5n” you see is probably “Sn”, which I think means “tin” or “lead-free”.
But i did open up another one of these devices and i can still all the number on all of them now. transsitor
Power transistor BAV99 A7W smd A7 SOT-23
The correct numbers are: Just got to figure out exactly whats going on to make this happen. Thanks Again Added after 2 hours 21 minutes: So i think Now the problem i have still is how is the MCU sending out a 3. And it is long enough to turn on the WJs transistor giving raise to the first paragraph which powers the vregs.
Just a good guess or is this how transstor might work? I’ve include pics of spice with those transistor laid out like the above PCB picture. Trying to find what this IC’s do try to visit this site http: Trying to find what this IC’s do Hi, Check markingcodes’ original type no is our major job. Welcome to join our gold member. The markingcode promblem you post, i checked them for you. PHI David david smdok. Our database incluses the codes of transistors, diodes, tvs, thyristors, ics, etc.
You will be suprised to find many dip components’ transkstor and many smd codes those hard to find in the internet or anywhere else.
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BAV99 A7W SOT23 ESD Protection of I/O pins  : Sunrom Electronics/Technologies
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