DATASHEET and Circuit Diagram

The herein schematic appears typical stepper motor application with NJM3771. This stepper motor driver device is designed for use in microstepping applications in conjunction with the matching dual DAC (Digital-to-Analog Converter) NJU39610, according to the datasheet.

NJM3771 Dual Stepper Motor Driver features Dual chopper driver, 650 mA output current per channel, and Selectable slow/fast current decay for improved high-speed microstepping. Instead of capable for driving up to 650 mA continuous motor current, each channel of the NJM3771 consists of an H-bridge output stage, a logic section that controls the output transistors, an S-R flip-flop, and two comparators.

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The herein schematic appears MAX242 Multichannel RS-232 Drivers/Receivers Pin Configurations diagram. The pin configuration schematic outlines TTL/CMOS inputs – outputs, RS232 inputs/outputs, Ground, Voltage Doubler, and Voltage Inverter.

MAX242 is one of MAX220–MAX249 family of line drivers/receivers for all EIA/TIA-232E and V.28/V.24 communications interfaces. They are used to be applied in applications such as Portable Computers, Low-Power Modems, Interface Translation, Battery-Powered RS-232 Systems, and Multidrop RS-232 Networks, according to the MAX242 datasheet .

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The following circuit schematic illustrates voltmeter hookups for voltage drops testing of a General Motors (GM)-type cranking circuit. As we know, voltage drop is the drop in voltage that happens when current is flowing via resistance. In voltage drop testing, low voltage drop shown low resistance and high voltage drop means high resistance.

The voltage drop testing circuit above shown:
V      = Voltmeter
V1    = Testing + Battery Cable
V2    = Testing  – Battery Cable
V3    = Testing Solenoid

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A schematic described Resistor Color Code and Chart Diagram appears in the following illustration. Resistor is such a device for a two-terminal electronic component that produces a voltage  across its terminals that is proportional to the electric current passing through it in accordance with Ohm’s law (wikipedia.org).

This electronic color code was developed in the early 1920s. In the Resistor Color Code and Chart, Resistor values are always coded in Ohms. The chart outlines resistor color code (black, brown, red, orange, yellow green, blue, violet, grey, white, and gold), 4/5-Bands Code (1st, 2nd, 3rd, multiplier and tolerance).

With a few resistors, LEDs and using a LM3914 bar/dot display driver IC we can construct a simple 5V Voltmeter Monitor Circuit which provides TTL-compatible undervoltage and overvoltage warning signals. A complete circuit can be shown in the schematic below.

This voltmeter monitor circuit is useful where quick and easy voltage adjustments must be made. It may be applied where the overvoltage and undervoltage warning signals provide an attractive extra and also can be used to monitor any higher voltages, positive or negative.

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The following illustration schemes MM74HC165 parallel-in/serial-out 8-bit shift register pin assignment diagram. According to the datasheet, this device utilizes advanced silicon-gate CMOS technology.

This device able to be clocked through the inputs at each functioning gate (NOR, CLOCK, CLOCK INHIBIT, SHIFT/LOAD – as seen in the pin assignment schematic). All inputs are protected from damage due to static discharge by internal diode clamps to VCC and ground. The 74HC logic family can functionally worked as well as pin-out compatible with the standard 74LS logic family, according to the MM74HC165 datasheet.

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A theory related on DC Motor Speed Controller includes the speed control application circuits are described in the following document. In order to take a signal representing the demanded speed, and to drive a motor at that speed, a motor speed controller is needed.

What you will find in the depth of the document are sections such as Theory of DC motor speed control, The action of inductive loads, and inductors, PWM frequency, Choosing a frequency based on motor characteristics, Speed control circuits, Regenerative Braking Circuit, Reversing DC Motor, The Full Bridge Circuit, Generating PWM signals (using 74HC14, 74HC163, LM324), Current limiting circuit, and Feedback Speed Control.

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The schematic below shows TLE5206-2 5A H-Bridge for DC Motors Circuit Application. It such a device which has an integrated power H-bridge with DMOS output stages for driving DC-Motors, according to the datasheet.

TLE5206-2 Circuit Application describes Input Circuit, Output Stages, Undervoltage Lockout, setting of the Error Flag in Protective Function (Output Shorted to Ground Detection, Output Shorted to + VS Detection, Overload Detection, Over Temperature Protection).

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SA58631 is single-channel audio amplifier which generates a power output of 3 W with an 8-Ω load using a 9V supply. The herein schematic appears SA58631 Audio Amplifier Block Diagram.

The SA58631 has a Bridge Tied Load (BTL) amplifier with a complementary PNP-NPN output stage and on-chip logic for standby and mute. It can be switched to standby and mute conditions through the MODE pin. For such those features, this SA58631 device is a fine choice for portable applications (mobile radios, toys, games, and PC sound cards, and more).

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The schematic below appears Electronic Siren Circuit Diagram using 741 versatile IC. The siren can be used as the home alarm output or automobile security system.

This Electronic Siren Circuit Diagram is built by semiconductors and components such as 741 Operational Amplifier (IC1,IC2), AC187 – T1, AC188 – T2, Resistors R1-1M ohms, R2-8 100K Ohm, Capacitors C1-0.1uF, C2-0.01uF, C3-100uF 25V electrolytic and Ls1 8 Ohm 1W Speaker.

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