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TABLE OF CONTENTS Robotics
3.2.9 Some Lab Components
While working with electronic circuits we generally come across so many electronic components that one needs to know. Some of the components that are most common are described below:
IC 7805
The 7805 supplies 5 volts at 1 amp maximum with an input of 7 25 volts.The 7812 supplies 12 volts at 1 amp with an input of 14.5 30 volts.
The 7815 supplies 15 volts at 1 amp with an input of 17.5 30 volts.
The 7824 supplies 24 volts at 1 amp with an input of 27 38 volts.
The 7905, 7912, 7915, and 7924 are similar but require a negative voltage in and give a negative voltage out.
Note that the electrolytic 10 uF must be reversed for negative supplies. Ensure that the working voltage of this component is sufficient. Say 25 V for the 5-, 12-, and 15-volt supplies and 63 V for the 24-volt supply.
FIGURE 3.26 (a) 78 series. (b) 79 series voltage regulators.
FIGURE 3.27 ULN 2803.
The other two capacitors can be 100 nF/100 volt working. The 78L series can supply 100 mA and the 78S can supply 2 amps.
Eight Darlington Arrays
High-voltage High-current Darlington Transistor Array- Eight Darlingtons with common emitters.
- Output current to 500 mA.
- Output voltage to 50 V.
- Integral suppression diodes.
- Output can be programmed.
FIGURE 3.28 ULN 2803 (pin connection).
- Inputs pinned opposite outputs to simplify board layout.
- Versions for all popular logic families.
Description
The ULN2801A ULN2805A each contain eight Darlington transistors with common emitters and integral suppression diodes for inductive loads. Each Darlington features a peak load current rating of 600 mA (500 mA continuous) and can withstand at least 50 V in the off state. Outputs may be paralleled for higher current capability.
The output of the ULN2803 is inverted. This means that a HIGH at the input becomes a LOW at the corresponding output line. E.g., if the motor line connected to pin 1 goes HIGH, pin 18 on the ULN2803 will go LOW (switch off).
The ULN2803 is described as an 8-line driver. This means that it contains the circuitry to control eight individual output lines, each acting independently of the others. The IC can be thought of as an 8-line black box.
LM 324 IC
FIGURE 3.29 14-pin DIP .
LM324 Quad Operational Amplifier
- The LM 324 is a QUAD OP-AMP.
- Minimum supply voltage 6 V
- Maximum supply voltage 15 V
- Max current per output 15 mA
- Maximum speed of operation 5 MHz
FIGURE 3.30 Pin diagram of ULN 2803.
FIGURE 3.31
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