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Lec 4 B

This circuit diagram shows an adjustable voltage power supply that uses a 555 timer integrated circuit to regulate the output voltage (Vo). The 555 timer compares the output voltage to a reference voltage and uses its output to control a transistor that adjusts the output voltage. A potentiometer is used to set the desired output voltage between 0-10V. The circuit includes resistors, capacitors, and a diode to provide the necessary power supply and timing signals to operate the 555 timer as a voltage regulator.

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60 views2 pages

Lec 4 B

This circuit diagram shows an adjustable voltage power supply that uses a 555 timer integrated circuit to regulate the output voltage (Vo). The 555 timer compares the output voltage to a reference voltage and uses its output to control a transistor that adjusts the output voltage. A potentiometer is used to set the desired output voltage between 0-10V. The circuit includes resistors, capacitors, and a diode to provide the necessary power supply and timing signals to operate the 555 timer as a voltage regulator.

Uploaded by

speedaswin
Copyright
© Attribution Non-Commercial (BY-NC)
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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Adjustable Voltage Power Supply

+15V

270Ω Vo
0.1uf
1uf
10K
1N758 V+

10v
V-

6.091 IAP 2008 Lecture 4 Appendix p1


555 Block Diagram
VCC
ready 8

5k
Threshold 6 +
7
Comp
Discharge
5 _A R Flip
Control Voltage Flop
5k Q
+ Inhibit/ 3
Comp S Reset Output
2 _B
Trigger
5k

1 4
+15 +15 Gnd Reset

+15 8
Figure by MIT OpenCourseWare.
R
reset

1k 10k 555 output


Trig<1/3 Thres>2/3 Reset Output
threshold
S R
trigger
1k
1 1 1 last state
1N914 discharge

C 0 1 1 low
control
0.1uf
1 0 1 high
1
0.01
uf 0 0 1 high

NA NA 0 low

6.091 IAP 2008 Lecture 4 Appendix p2

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