Flyback topology is usually used for DC-to-DC converters, and not for DC-to-AC conversion. Also flyback topology is much more complex (not as simple as your circuit) as it normally requires feedback (usually via optoisolator and/or a tertiary winding on the transformer) plus the use of custom SMPS transformers. You can find this topology very common in AC-to-DC adapters, including those in power supply section of LCD/LED monitors and TVs...

Power electronics just aint my thing

This post has been edited by kink_ass: Jul 2 2013, 12:44 AM

Example of typical flyback configuration using all-in-one PWM power I.C which has lower complexity (instead of PWM I.C + MOSFET). Source: Power Integrations: TOPSwitch-JX...



Below is an example of the recommended push-pull inverter configuration. Source: Electronic Circuits and Diagram-Electronics Projects and Design: 60W inverter using transistors...



All components used in that push-pull inverter are easily available (ie. common parts and does not use custom transformers).

This post has been edited by lex: Jul 3 2013, 11:41 AM

Thanks

Does anyone know where I can get customised high frequency transformers?

Or rather,

any shop that helps you wind a transformer according to your primary and secondary inductance specifications?

This post has been edited by kink_ass: Jul 10 2013, 01:39 AM

You could try getting transformer cores from places like RS Components, Farnell/element14, Mouser and/or Digikey. Then make a custom transformer. Do note that the core material for high frequency transformers are rather specific type (not the standard soft iron core). Alternatively search in places like eBay, Utsource, Hong Kong Inventory, AliBaba, AliExpress, etc...

Try the back lane at Pasar Road. If not mistaken there's a shop specializing in transformers there.

Which back lane? I went to a shop selling transformers before but mostly low frequency and bulky ones.

I would only get the transformer cores and frame if only I knew the proper technique of winding

Not the normal ferrite cores in standard (low frequency) transformers, but specific grade and type of ferrite core (to avoid over-saturation) for high frequency SMPS operation.

Not sure which shop you've went to, or if its the shop I've mentioned. For your information, the shop is not facing the main road and sells mostly transformers...

As for manually winding the transformer, mostly trial and error. The wire gauges (ie. AWG) also for primary and secondary coils have to be considered also...

Hmm, went to the one that is on the same row as NIXIE and ONLINE but a few blocks up closer to the main road.

By, any chance are you good at winding?

Nopes, its nowhere on the main road. As I've mentioned earlier, the shop is not facing the main road (in other words not on the main road).

I don't usually wind transformers. Amature at best...

Hello everyone.
how do you guys deal with switch debouncing.
I always have problems in my circuit where a single press read as multiple plresses.

Quite rare here in Malaysia, unless you come across those that have been programming industrial automation machines, remote control devices, alarm systems, tracking devices, etc..

There are plenty of tutorials on the web on how to debnouce switches (the most common is using resistor and capacitor in combination with schmitt trigger, or using a pair of NAND gates). What is the switch type and/or circuit? Is it a normally open SPST (push to make), normally closed SPST (push to break), or non-latching SPDT switch? Is it using pull-up or pull down?

the one I made for my mini project this year uses push to make switch with pull down resistor.
one push and the number goes fast as hell.
I am thinking of using the same type of switch on a small project that I am going to make soon.
I don't want to have bouncing switch problem again

Simplest solution is to add a capacitor in parallel to the pull down resistor. The moment you press, the capacitor charges up quickly thus maintains the voltage for a while (thus spurious impulses will be smoothed out), until the pull down resistor discharges it at a slower rate. The values of the capacitor and pull down resistor will depends on your requirements (e.g. the minimum pulse time when the switch is pushed temporarily).

could there be a calculation for the capacitor and resistor values?
It won't be long,it is just a finger jab on the switch to turn things on

You can find lots of tutorial on capacitor discharge calculations on the web. Usually the usual V=Vo*e^(-t/(R*C))

thanks and will do.

hey guys, need to ask one question...
i have an arduino board and a rfid module on hand but it comes with a 12 pin interface instead of the typical 4 pin interface. the manufacturer provided me this pin map info.

1 - VCC (3.8 ~ 4.2V, typ 4V)
2 - VCC (3.8 ~ 4.2V, typ 4V)
3 - GND
4 - TXD (IDRO900MA ->HOST)
5 - RXD (IDRO900MA <- HOST)
6 - Not Used
7 - Not Used
8 - Not Used
9 - Not Used
10 - Not Used
11 - GND
12 - RESET (It is necessary for Firmware update)f the typical 4 pin UART interface.

would be safe or possible for me to connect 2 VCC from the arduino board to the module?? i just started on arduino so i am not sure on a lot of things..

You can use a multimeter to check whether those 2 pins (ie. pin 1+2) on the board are shorted. Most likely they are power supply rails. Anyway, is this board is running on 5V power supply? 3.8V to 4.2V looks kinda low...

it seems that they are power rails as there is no power supply input provided...
i am actually looking at connecting pin 1 and 2 to 2 separate VCCs that are available to me through a shield..
according to the manufacturer, they said that the "Reader Module can operate in 5 voltage. But, We recommend you to use 4 voltage."
so it seems it might work..

Still, check the pins on the board. If they are connected together then using two separate power rails may be not be a good idea. If one rail is slightly higher than the other rail, then there will be current flowing from the higher potential to the lower potential rail.

Using two silicon diodes in series would reduce that 5V down to around 4V or less (due to the diodes forward voltage drop).