Akula0083 30 Watt Self Running Generator.

[d3x0r]

Well, it's hard to figure out what's going on from that photo-loop, but one of your scopeshots looks just like what

it's a video... click on it.

[TinselKoala]

Well... I just received my new batch of 10 chips from China. And I can confirm that there are some differences in behaviour when compared to the chip I used for the video demonstration-- even though they all claim to be from the same manufacturer, ON Semiconductor.

The old chip is marked:

34063AP1
        XAA
and the third line has a shiny black concave dot marking Pin 1, the ON-in-a-circle logo, and digits 0244

The new chips are marked:
34063AP1
NCCKXNS
and the third line has no black dot, has the ON-in-circle logo (but looks kind of funny) and digits 1236

Both types have the usual edge-notch on the 1-8 pin side. The new ones are much easier to read, the markings are higher contrast.

The new type seems more sensitive to low voltage operation. Sometimes it makes a double-peak waveform at TP 1. Overall so far, I think the new ones work "better", for certain values of "better". At least they light the LEDs at lower input voltages.

[eugene900]

good to know. today i receive my 50 pcs bud dont pay atention on marks. when found some free time will produce some " receiver" 

[gpufo]

@TK
Hi,I got a stable waveform,but the frequency is about  212Khz. I can't increase it to 640Khz . Can you give some suggestion?
Now my parameters are:

C1--33pF
C2--500pF
Primary coil--(20  0.1mm enamelled wire roll up to a Litz wire) * 28
Secondary coil--(0.6mm enamelled wire) * 66
D1--1N4148
LED--White light and diameter is 5mm

I also used a PCB.My waveform as follow:
Oh, my oscilloscope probe is 100:1 .

Best Regards
gpufo

[AlienGrey]

On the video i shared i got the Feq twice that, 460 Khz but I  had to use a 10 pf i got my chip a good while ago an ST CHN 063A, I did notice Tinselcoala's litz wire is very fine wire, it might be an idea to get an old relay coil and put a pair of nails in a 1o ft piece of wood one at either end and go up and down till the thickness is about 1 to 1.5 mm thick and use that as the litz, then re try keeping the C on the PCB as low as possible, good luck. mine still doesn't work! I haven't had the time to do the mods yet !