Ghani Lawal- De-soldered +5V regulator with some difficulty
- Soldered a new one, output was still ~1.0V
- ***Found out there the +5V power and -5V power lines were shorted together
- Location of the short circuit was at U18, the high precision op-amp in the Rhi-Control circuit that is being used as a voltage follower, removed it from the PCB, -5V regulator output is now -4.9V
- Even when disconnected from external circuitry, the op amp power terminals are still shorted together
- Soldered a new 5V regulator, now both +5V and -5V are delivered to the op amps
- Took U18 from old PCB and soldered it onto the new one, ensured the power terminals were not shorted together
- When I turned the device on, the power terminals of U18 shorted again...
- Took it off the board
- ****** I removed both + and - 5V regulators earlier because they were overheating due to the short, and I assumed they were broken, turns out they have internal circuitry that protects them from damage due to shorts... Which I knew that earlier, should have read the data sheets
- I have spare 2N2222 NPN transistors, made a voltage follower (CE) circuit out of it
- Diode doesn't "turn on" until Vi is >= 0.658V (as modelled in LTspice), therefore max voltage sent to Rhi terminals is 2.842, didn't need the full 3.5V range anyway
- Soldered the voltage range and LED brightness potentiometers to the board, the Voltage range pot is working properly
- Soldered LED driver holders to the breadboards, then inserted the drivers as well
- Soldered the plug source terminal, Dot/Bar header pins and source switch
- Soldered Sub-Bass LEDs
Solder Update
A project log for Music Spectrum and dB Visualizer
Receive input from a 3.5mm jack, divides the music into 7 frequency bands, shows the loudness of each frequency band in DB using LEDS.
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