Recent content by Acca

If not oscillate swap BDT primary wires. Working frequency is 30kHz.

Micro SMPS Really micro SMPS :) Schematic same as on first page My version use: Transistors: 13003,no heatsinks Bias Resistors: 680k Divider capacitors: 47nF 250VDC (I plan to use 100nF) Feedback resistor: 100R 0,5W Bulk cap: 33uF 400V Output cap: 470uF 25V Input is rectified with only one...

Pic's Here's waveforms in BJT schematic,and first picture is H bridge FET version.This is pctures from my friend.He winded 8turns on BDT primary instead of 4,because,as he say,it work better :) His BDT now have 8t and 2x4t for bases.

And bridge version of fet smps:

FET version This is version with fet.GDT is same toroid as in BDT version.Fet version can use core from RF filters as GDT.First pic is UU core winding (must remove gap between core halfs) Freq is 50-60kHz

Hi all,here is my very simple SMPS for all wiz:; All details is on picture.I will show you pictures of smps working soon :) If you have any questions ask here PCB soon ...

UU core winding like toroid:

Here's my d3k amp.It sound's good.No hiss or noise in speaker.Output DC max +/-15mV It use separated and isolated gate drive which is recommended for high powers.It can operate from +/-6 to +/-120V.For higher than +/-120V there's another circuit but it's almost not needed that high power...

Promised schematics:

New SMPS Here's my new SMPS with FET's.It's used to power my laptop but can be used for any purpose.It has short circuit protection (tested) and can give up to 300W power with E33.You can use bigger transformer and more power FET's for higher power.Changing 47R will change frequency.In few days...

This is tested up to 5kW with power IGBT.On overcurrent it shuts down.To reset you can add reset switch parallel to SCR or wait to elko's been discharged through 100k and 470k (better). BDT is small toroid from CFL lamp,GDT is E33 and power transformer is ETD59 or another GDT can be E25 but it...

Hi Microsim, DT is ok.It's not seen without load but when I load it,DT is seen.I'll show you when recharge batteries on camera :) This version maybe will be used,but not tested yet.Test will be in few days.

Tests Here's pictures from some tests.Tomorrow I'll try to power 2kW heater. Oscillograms is for BJT base,for IGBT gate and for output.

Hello all :) I try to make simple but powerfull SMPS for audio amp. or similar equipment. I have one IGBT brick SKM75GB123,and I like to use it in SMPS. This IGBT isn't for high frequencies,and this means that oscillator must have f. about 20~30kHz. I make a simple oscillator like from CFL bulb...

Camera repaired,here's pictures of fullbridge: