Electronics Projects, Modified ATX Power Supply Half Bridge SMPS Project TL494 EI33 article
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ATX SMPS half bridge circuit modified version of the computer power supply circuit output for high voltage power transformer ei33-2 symmetrical re-wrapped. 300 watts of power input voltage 240v AC output voltage + – + 20volt – 45volt set.
High-power amplifier circuit can be used to run additional tone control circuit in 7812 preamf positive negative voltage regulator ICs with 7912 + – 12volt taken out
TL494 SMPS Circuit Modified ATX Power Supply
switching power supplies are ideal for powering audio amplifiers. Present the possibility of regulating the output voltage secondary, tertiary and further incorporate fixed outputs (+ -15 [V]) for feeding filters, preamps, etc..
The use of switching sources such avoids the need for costly, heavy and bulky current transformer, plus grinding and filtering steps corresponding. All necessary information, schematics, PCBs, etc. are located in their respective files.
Compact SMPS power supply: – Theoretical output power: · ~ 250 [W] core IE33-23-13 (typical ATX).- Frequency Driver: 160 [kHz] approx. – Adjustable output voltage + -24 to + -42 [V] approx.- Tertiary fixed voltage outputs (+ -15 [V]).
Source: forosdeelectronica.com Modified ATX SMPS circuit schematic pcb files alternative link : modified-atx-power-supply-half-bridge-smps-project-tl494-ei33