Electronics Projects, TL494 PWM Motor Control article
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TL494 PWM control IC with a built motor drive circuits MOSFETs without the use of low-flow P channel N channel and NP channel MOSFETs powered by different circuits have a splen prepared with schematic drawings sprint layout prepared by the PCB (np two MOSFET circuit) available
TL494 PWM Circuit
A PWM (pulse-width modulation) DC in many packages pulsed Comparable to flasher circuit on a car gets to the consumer (for example, a light bulb) is not “full” power, but just Now is the PWM specifically not to blink That is why the “Blinking”, ie the output frequency of follow package usually so high that they are not visible, would you connect a lamp. For example, at 300 hertz solenoid valves or motors or even 20 kilos Hertz and more for other applications. Crucial for the performance at the output is less the frequency, but the clock ratio, ie the ratio of and packages. While the frequency for an application usually set, makes one stroke ratio adjustable and thus regulates the performance.
Pulse-width modulation with TL494 The TL494 is an extremely comfortable pulse-width modulation IC and has long been on the market.There fore it is also relatively inexpensive. An IC with many features, and there is the spare no reason for any of the other, newer types, which may be difficult availability, or the 10-to 20-fold cost.
Source: atx-netzteil.de/ TL494 PWM Motor Control PCB schematic alternative link: tl494-pwm-motor-control.rar alternative link2 alternative link3 alternative link4