Portable, rechargeable ARP wave machine that uses a background frequency and an active frequency.
Currently using the attached original schematic, but creating a custom PCB for portability and size constraints. The original used a 9V battery which would die about every 6 hours. The goal for the new one is to use one of many extra 18650 Li-Ion cells I have laying around instead.
Components used: 2X 555 timers (Might go to the 556 for ease) All NPN = 2N2222 or equiv. All PNP = 2N2907 or equiv. All CR/Diodes = 1N914 or equiv. All Capacitors = rated at 16V or above All R's = 1/4 Watt unless stated elsewhere
2X 42TM003-RC Transformers in series (starting at the 8 oHM side for proper voltage delivery) connected to a 3.5mm Jack 1x 10K Pot for output strength 1x 1M Pot to control the Active pulses per second.
USB-C Connector for charging/power Charging/ System Power Path Management IC = BQ24030RHLR (attached datasheet) Buck Boost IC = TPS61200 (attached datasheet)
Questions/ Hang up's: Make sure I did the proper schematic and diagram for the BQ24030RHLR - LED Indicator placement for Charging/Battery status - Resistance Values in accordance to the 18650 Cell for charge speed etc.
Can the nominal 3.7V supply the 9-12V needed through the buck/boost without causing issues? Do I need any additional protection IC's for the battery i.e. Over discharge, under discharge, etc on top of the BQ24030RHLR? - Buck/Boost IC a good one or should I consider something else?
To Do: Add on/off Switch Add active mode on/off switch Correct placement for POTS
Any other considerations?