Electronic circuits schematics and projects

UCN5804B stepper motor driver circuit diagram

Eltech — Sun, 25 Jun 2017 18:07:16 +0000

This stepper motor driver circuit is designed using UCN5804B driver IC especially designed to drive 6 lead unipolar stepper motors .
This stepper motor driver circuit is designed for 5, 6 & 8 lead unipolar stepper motors (the four lead
bipolar stepper motors are not supported by this circuit).
The direction of stepping can be changed by a switch and three stepping modes are possible.
Unipolar motors may have 5 leads but generally have 6 or 8 wires.

Motor Control Circuits

Circuit Diagram:

A6269 automotive LED driver array circuit diagram

Eltech — Sun, 09 Apr 2017 15:45:47 +0000

This A6269 automotive LED driver array circuit is designed by Allegro MicroSystems and can be used in automotive application using a 12 or 24 volts power supply.
The toggle action of the SW input will be reset to off at each power-up. From this stage, applying an EN = high signal turns the LED on, and an EN = low turns the LED off.
When power is applied (with EN connected to VIN), there will be a short startup delay, tON , before the current starts to rise. The rise time of the current will be limited by the internal current slew rate control.

Led drivers

Circuit Diagram:

12V power supply circuit

Eltech — Tue, 28 Mar 2017 06:55:50 +0000

This 12V power supply circuit will provide a 12V regulated output with a maximum output current up to 3 amperes.
This 12V power supply circuit use the CA3085 IC voltage regulator with features like: good load and line regulation, output current up to 100mA (which can be increased to several amperes with additional pass transistors), output short-circuit protection, and lower input voltage.

Power Supply

Circuit Diagram:

MC1496 balanced modulator circuit

Eltech — Thu, 23 Mar 2017 20:02:52 +0000

This circuit diagram shows the MC1496 IC in a balanced modulator circuit operating with +12 and –8 volt supplies. Excellent gain and carrier suppression can be obtained with this balanced modulator circuit by operating the upper (carrier) differential amplifiers at a saturated level and the lower differential amplifier in a linear mode. The recommended input signal levels are 60 mV rms for the carrier and 300 mV rms for the maximum modulating signal levels.

Radio Frequency

Circuit Diagram:

DC motor speed controller using PWM

Eltech — Mon, 01 Feb 2016 20:23:15 +0000

This dc motor speed controller is designed using pulse width modulation (PWM), and can be used in circuits for controlling electric motors speed that require a maximum current of 2A. Of course the circuit can also be used for engines that have a higher consumption of 2 A, except that in this case it is necessary to provide additional cooling to T2 transistor TIP3055 type, and increase the value of C2.
The circuit is based on IC1 IC type 40106. Output of IC1a remain in 0 state at a time determined by R1 and in state 1 a period determined by R2 and P1.

Motor Control Circuits

Circuit Diagram:

Voltage monitor circuit using LM393

Eltech — Wed, 22 Oct 2014 18:35:27 +0000

This voltage monitor circuit is designed using LM393 operational amplifier and it has two has two light-emitting diode (LED) indicators that switch on if the monitored supply voltage falls below separate threshold levels.
This voltage monitor circuit can be used to monitor the DC supply voltage, and it will then give a warning if the supply voltage drops to an inadequate level due to a malfunction.
With the specified components values the circuit provides threshold potentials of 10V and 12V.

Detectors

Circuit Diagram:

Laptop power supply circuit using TOP269EG

Eltech — Wed, 27 Aug 2014 19:31:30 +0000

This laptop power supply circuit diagram is designed by Power Integrations, using TOP269EG integrated controller.

Power Supply

Circuit Diagram: