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Jogging Timer (CD4093)

2016-10-26 09:37  
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This article describes the Jogging Timer (CD4093). The principle is very simple, very practical. The circuit components can help you understand better grasp this principle. For example, in this circuit, you can go to find and buy these components: CD4093.

3V Battery powered

Circuit diagram:

Jogging Timer

Parts:

R1_____________47K   1/4W Resistor
R2_____________10M   1/4W Resistor
R3______________1M   1/4W Resistor
R4_____________12K   1/4W Resistor (see notes)

C1,C3__________10µF   25V Electrolytic Capacitors
C2____________100nF   63V Polyester Capacitor

D1___________1N4148   75V 150mA Diode

IC1____________4093  Quad 2 input Schmitt NAND Gate IC
IC2____________4060  14 stage ripple counter and oscillator IC
IC3____________4017  Decade counter with 10 decoded outputs IC

Q1____________BC337   45V 800mA NPN Transistor

SW1___________1 pole 9 ways Rotary Switch (see notes)
SW2___________SPST  Slider Switch

BZ1___________Piezo sounder (incorporating 3KHz oscillator)

B1____________3V Battery (two 1.5V AA or AAA cells in series etc.)

This circuit was developed since a number of visitors of this website requested a timer capable of emitting a beep after one, two, three minutes and so on, for jogging purposes.
As shown in the Circuit diagram, SW1 is a 1 pole 9 ways Rotary Switch. Setting the switch in position 1, the Piezo sounder emits three short beeps every minute. In position 2 the same thing happens after a 2 minutes delay, and so on, reaching a maximum interval of 9 minutes in position 9.

 


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