LiFePO4 battery charger (CN3058), protector (HY2112) and 5V Booster (ME2108).
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Simple single ended primary inductance converter (SEPIC) based on the MT3608 with a fixed output voltage selectable by the resistor values of the voltage divider.
Copied from the chinese version of EasyEDA:
Input voltage: 2.7-13V
Up to 16V output voltage
Supports 30W Average PowerLoad and 40W Peak PowerLoad from 3.3V
600kHz Fixed Switching Frequency
RunOffGroove Fetzer Valve Revisited. This circuit aims to emulate 12AX7 triode stage in Fender amps. It uses a J201 N channel J-FET. Carefully biased, it works pretty well, you get a neat, loud and full of harmonics sound, with a lot of gain (depends on the J201, it's better to sort and measure them with...
WARNING Overvoltage-Reverse voltage protection with PTC and diode, Overcurrent Protection with PTC U2-U3.
Overdischarge protection with microcontoller.
Wrong setting may cause Injury or Overheating.
Overheating + Battery = Acidic gas + Fire + Expolosion. Only for indoor and well ventilated areas.
Produce at your Own Risk
12 to 15 volt step up converter,12V lead acid battery charger, output voltag...
This schematic has a few functions to this circuit. This circuit takes voltages starting from 4V to a max. of 13V. It was an open source project I found online. I've redone this board's schematic. But when it came to de PCB design I kinda lost it. I got as close to sorting the components on the board, but I didn't know where to start connecting wires or how. I'm taking a little break, but if anyon...
A Lipo charger and protection circuit, a boost converter, a bunch of WS2812b and an ATMega328p - All of this makes a circuit forremote operating LEDS.
The circuit include a header to plug a RF module (nRF24 ?).
The ATMega is used with it's own internal oscillator (not precise 8MHz), but it's sufficient enough to drive this small circuit.