To be deleted

[itsu]

While waiting for the correct BC327 transistor i setup the circuit on a breadboard using a 2N5401 transistor instead.

Smallest pot core i had using 0.45mm dual bonded magnet wire (green/red) 5 turns measuring 184uH each and when shorting
the other windings i have 0.84uH left (for leakage inductance calculations).
The capacitance inbetween the 2 windings is 96pF.

Using a 3.7V lion battery pack.

Using the 50K pot i set the frequency to 130Khz.

Input current was measured in 3 ways,
1 using a normal DMM in mA DC (10mA),
a 10 Ohm 1% inductionfree resistor in the return line measured with the yellow probe 97.mV / 10 = 9.7mA and
finally my current probe showing 9.6mA (green trace).

With a 1 Ohm csr it was hard to correctly measure the current.

So i am fairly confident that the DC input current is around 10mA and i will use the DMM for continue monitoring.

Video here: https://www.youtube.com/watch?v=22IEuVtAIIk&t=24s


Itsu

[itsu]

From the above video we see that in this setup the input power is 10mA x 3.88V = 38.8mW

The green led is pulling 5.7mA rms at 2.52V rms for a power of 3.985mW see screenshot 1

The red (load) led is pulling 11.22mA rms at 2.056V rms for a power of 23.07mW see screenshot 2

The transistor path (main led branch??) is pulling 16.08mA rms at 3.912V rms for a power of 43.38mW see screenshot 3


Not sure yet where to take additional measurements to get to the same conclusion as NP did, but will figure that out.

What i notice is that the lion battery pack voltage is raised somewhat (3.88 v 3.91), not sure where that comes from, probably some chemical reaction.

Yellow is the voltage across the led / transistor
green is the current (current probe) through that led / transistor
red is the math trace yellow x green (voltage x current)
blue is the voltage across the lion battery pack.
Itsu 

[nul-points]

thanks for the info, itsu, a very thorough inspection as always! - it looks like you have the whole circuit covered for measurements!

i agree about the 1 ohm CSR - i only used the CSR with the scope, to make a ballpark check on the supply current duty cycle and relative magnitude & current direction (for which it performed acceptably and supported the DMM current readings); so most written readings taken using DMM,  no CSRs, no supply capacitor (so far)


i also checked the supply to the drive branch (ie. the non-feedback branch) and confirmed that the current there is unidirectional from the supply to the transistor/primary/main LEDs, and also that the average of that current is higher than the average supply current by approx 20%

i see that i forgot to mention that the 2 main LEDs are 'cold white' type (hence 2.7VDC across the electrolytic cap //main LEDs); and just for info the bias pre-set resistor value is approx 20k Ohm

i hope this additional helps confirm the circuit i'm using

thanks

[itsu]

NP,

thanks for this additional info,  good to know, i will make some led changes then.
I measured my potmeter to be at 8K for the 133Khz

My measurements are just some praktice runs untill i get the BC327.



During the few hours of testing, the DMM monitoring the input current went from 10mA to 10.7mA and
the voltage across the battery pack (not monitored from the beginning  ) slowly drops using a Fluke 179 meter
from 3.791V to half an hour later 3.788V.

Itsu

[nul-points]

that all sounds pretty much nominal  - your cct is drawing approx 2x current as mine using a bias resistor value about half of mine

my battery is 60 or 70 mAh and a full charge takes approx 10-11hours to deplete, and i believe your battery is approx 840 mAh, so a full charge on your battery should deplete in approx 84 hours


thanks