CD4093 | Electronic Project Circuits

Posts Tagged ‘CD4093’

5 Minutes Time Delay using CD4093

This be delay timer circuit model to be simple. It be the character delays to close electric all appliances. By fix the time about 5 minute. It can fine decorate the time. When see the circuit uses digital IC number CD4093 make good easy. And use transistor driver relay. It performs to edit the electricity gives with load or the electric appliances is all. When see our circuit uses electronic part that seek easy. May have no the problem about part. For LED1 use for display when feed power supply reach the circuit. It usability easily just press S1 for begin be usable.
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Categories: Timer Tags: CD4093, delay timer, Timer Switches

PWM D.C. motor drive Low loss speed control By 4093

This circuit is a very compact switching regulator for small DC motors. I use it for my small printed circuit board drill
(18 Volt, 1.5 Amp), but it is suitable for many other applications (e.g. 12V DC halogen dimmer).

Circuit description

R1, R2, C1, D1, D2 and CD4093 schmitt trigger IC1B build a 1kHz oscillator with adjustable duty cycle.
The output of the oscillator passes through buffer IC1B/C/D which drives power mosfet T1.

When T1 is switched on, a current will flow from the +Vmotor supply via the motor and T1.

When T1 is switched off, the motor current is interrupted; because the motor acts as an inductor,
it will try to maintain its current, which can flow through freewheel diode D3.

The avarage current through the motor depends on the duty cycle of the oscillator.

The circuit losses are very low, for my 1.5 Amp drill, no heatsink is required for T1.

Source : unknow …….