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I am aware of explosions and fire, I know what can happen with li-ion batteries. I still have to see myself what happens and why, so no need to worry about me. I have an electronics disposal place. No need to get off topic here.
Thx for the pdf! I looked through it and got the idea about...
Ok so for the protection I will use NCP360, this will provide the necessary protection for Li-ion batteries. I experimented a bit with circuits without protection and ended up having inflated battery that now is worthless so this lesson learned.
For the charging schematic, I need something...
Thank you for the schematic. This looks like it should work and I am going to try it in next days. Do you have any recommendations for clock frequency? should it be like 10Hz or can be 100kHz? Also what precautions should be taken for th Li-Ion as you mention voltage and current limitation. I...
Hello,
I want to make a charger from USB 5V port, to charge two series 3.7V Li-Ion batteries. What would be the standard cheapest approach? Should I buy a 2cell li-ion charger ic (MCP73213 but the price is huge) and place a step up to 7.4V? I want to make small and cheap ic. So currently I am...
Ok did some more testing. So everything was because of low supply voltage. Now I used 6V as a supply and signal got very clean and also whole scheme takes only 0.1A. What can be the theory why, with 3,7V supply voltage, this takes so much ampers and step-up gets hot? am I trying to boost too...
Hey again. So the transistor part is over, now I am going to add a step-up voltage regulator, so I could power everything from li-ion battery. I am using MIC2288:
R1:40k, R2:4,7k, so I get ~11V output (for now its good, input voltage 3.7V).
When I test this chip on a resistor, it looks quite...
I scoped the feedback pin, so the signal is 113kHz. **broken link removed**
And here is the signal on piezo **broken link removed**
Is this enough to see the waveforms? or where I should scope?
Hello, I am making a piezo feedback scheme (attached). I wonder why the transistor is heating up( it look like it starts cold and then in a while starts heating up, so maybe its something with capacitance)? I give +12V to scheme and amperage is jumping from 0.1 to 0.2A. The feedback signal is...
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