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Self-oscillating SMPS with saturable drive transformer
Self-oscillating SMPS with saturable drive transformer
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Old 4th June 2005, 12:39 AM   #21
Eva is offline Eva  Spain
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When a control IC is employed it's quite easy to ensure proper switching even at no load, just place a resistor between the center tap of the control side of the pulse transformer and +Vcc to induce an auxiliary base current.

See AT and ATX power supply schematics, most of them use this approach, you will see also a diode in series with that resistor to prevent it from stealing base current
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Old 26th June 2013, 10:39 PM   #22
Acca is offline Acca  Serbia
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Self-oscillating SMPS with saturable drive transformer
Quote:
Originally Posted by Dem View Post
. My main goal is to make something as simple as possible, without hard to find parts, I'm attempting to use parts only from old PC power supplies, dimmers, halogen tr-rs etc.
Here's it,my smps:
Uni. SMPS 2 - Smps - DiyAudioProject
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Old 20th November 2019, 11:45 AM   #23
JLeon is offline JLeon
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Could you tell me the name of the article? Please
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