Replace BD699

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#1
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Hai..

How's to replace that BD699 with common transitors?
like 3906+3055 or else for BD699.

Jeckson

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Quote:
How's to replace that BD699 with common transitors?
like 3906+3055 or else for BD699.

Exactly the way it is shown in the symbol for the BD699 darlington.

Charles Darwin, Lord Kelvin & Murphy are always lurking about!
Lee -.-
Riddle me this...How did the serpent move around before the fall?

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Tip142/147? I'd look at using mosfets rather than transistors and using an AVR to generate pwm rather than pure square waves to drive the transformer to get a smoother waveform and less loss in the transformer..

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any of TIP140,141,142 will work fine

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After it works with AVR, take Kartman's advice one step further. Condition the output for use with ADC and use it for closed loop regulation of the PWM. Then add a means of current limit.

It may be less costly to buy an inexpensive power inverter. You might enjoy building yourself and the education.

It all starts with a mental vision.

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Quote:
any of TIP140,141,142 will work fine...Tip142/147.

Will look at local store.BD699 no longer available at local store.

For MCU...My companions would like to reproduced it much for their cart sale at streets...there's C2051 SMD(0.5 US)/piece but they didn't understand how's work.

Jeckson

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Quote:
After it works with AVR, take Kartman's advice one step further. Condition the output for use with ADC and use it for closed loop regulation of the PWM. Then add a means of current limit.

I found this...
The MCU available at local store.
with ATtiny10 looks interesting.
Any ideas?

Jeckson

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I see low supply voltage cutoff. There is no current limit, no high side voltage monitoring. I would possibly start with a ATtiny25,45,85 for development.

It all starts with a mental vision.

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Thank's KitCarlson for suggestion.

Jeckson

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