Pulse Generator for Stepper Motor Driver with Ramp option

Pulse Generator for Stepper Motor Driver with Ramp option

This stepper pulse generator project is an easy solution for stepper controller drive. It’s a very important tool and can be used to drive stepper in standalone mode. It generates square wave pulses in frequency range 0-50Khz. This project has multiple features which are a must for stepper controller. It has on board frequency generator with wide span of frequency, Slide switch for direction control and jumper for enable or disables the stepper controller. AD654 is heart of the project and its generate the pulse for stepper controller, output frequency 0-50Khz, higher frequency output is possible by changing CT capacitor value connected between pin 6 and 7. Refer to data sheet of AD654 for alteration. The AD654 is a monolithic Voltage to frequency converter consisting of an input amplifier, a precision oscillator system, and a high current output stage. The board has on board LM317 regulator and have an input supply of 7-36V DC. A on board LED for power indication, PR2 trimmer potentiometer to set the frequency. PR1 is to fine tune the frequency, slide switch SW1 to change the direction of stepper motor, J1 Jumper to enable or disable the stepper controller. All outputs are TTL level. Change the R3 to 0E if stepper controller has opto-coupler input. Features Supply 7-36V DC Frequency Output 0-50Khz (TTL Level) Direction Signal TTL Level, Change R3 to 0 Ohms for direct 5V Output Enable- GND or 5V D1 Power LED PR1 Fine Tune The Output Frequency PR2 Frequency Adjust SW1 Slide Switch for Direction J1- Jumper for Enable or disable the stepper Controller Circuit Available www.electronics-lab.com

Lecture - 9 Standard TTL Circuits

Lecture - 9 Standard TTL Circuits

Lecture Series on Digital Integrated Circuits by Dr . Amitava Dasgupta, Department of Electrical Engineering,IIT Madras. For more details on NPTEL visit http://nptel.iitm.ac.in

TTL RGB to VGA scan doubler

TTL RGB to VGA scan doubler

I was at the local retro computer meeting the other day and one of the guys was trying to interface the CGA video output to a VGA monitor with a Chinese 15kHz to VGA upscaler. It did work, but only if the picture didn't change. Otherwise the sync would drop out. I decided to have a go at making my own scan doubler. This one needs 2kB of 4-bit RAM (provided in the FPGA) to store a single line, which is then output twice in succession at double the speed. This gives a signal that's compatible with VGA. There is some sampling jitter, visible when I zoom in, because I'm running the board at 50MHz and the sample rate for CGA/EGA is 14.3181MHz. If I try it at a multiple of 27MHz I might have more luck. The machine is an NEC PowerMate 1 Plus 80286 with 4MB RAM and a 40MB hard drive. It has an EGA graphics card. I'm using a FleaFPGA development board from www.fleasystems.com, which is an excellent little board for this sort of thing.

Lecture - 10 Schottky (74s..) and Low power Schottky (74ls)

Lecture - 10 Schottky (74s..) and Low power Schottky (74ls)

Lecture Series on Digital Integrated Circuits by Dr . Amitava Dasgupta, Department of Electrical Engineering,IIT Madras. For more details on NPTEL visit http://nptel.iitm.ac.in

Audioscope schematic (magnetic deflection circuit, input freq = 50 Hz to 10 KHz)

Audioscope schematic (magnetic deflection circuit, input freq = 50 Hz to 10 KHz)

Video about how to make an audioscope with the help of an old school cathode ray tube, diameter approximately 22 cm. The coils that drive the dot on the screen are mounted around the neck from the tube. Find out whether it is the horizontal or vertical movement (from the dot). You can use two 3 watt audio amplifiers to drive the magnetic deflection coils X and Y (all low impedance, say 8 Ohm DC, see the schematic). These coils are driven via the 470 uF electrolytic capacitor to ground, minus. Maximum frequency that can drive the dot properly is, given the high inductance/impedance from the deflection coil, approx. 10 KHz. But very bright and super effects when you add different signals to the input from the Y and X aufio amplifiers (= 3 watt audio amps with their 470 uF cap. at their outputs, driving the deflection coils). Also good for scientific studies from phase differencies etc. The diodes in the HV tripler must be specific (!) HV diodes made to work properly on say 16 KHZ, normal diodes don’t work, even normal HV diodes in the 1NXXX range for (say) 1000 Volts. They load the 16 KHz coil to much, bringing the resonance frequency + (thus) energy output down. Use a protective resistor from the HV unit to the anode, otherwise your good HV diodes will burn out quickly. Value from that series resistor to the anode is in the video. Success! All the videos hat I have published on You Tube can be found via my Channel Trailer: Link is https://youtu.be/xbgQ8T3oqh4 In thematic order you can find these video’s under the “comments” section. My books about electronics are available via the website from “Lulu”, search for author “Ko Tilman” there. Link is https://www.lulu.com/shop/search.ep?keyWords=ko+tilman&type= My books are also available via Barnes and Noble and via Amazon. Regarding all my video’s: I constantly keep them actual, so the original video’s with the most recent information are always on YouTube. That is the source, and search there. When my video’s are reproduced or re-edited on other websites/channels you can not (!) be sure about the original content (=really working electronics) and important adaptations to the circuits. Be aware of that, I saw on the internet many of my circuits reproduced in a poor or even not proper way. I can not help that, sorry.

SERDES 2 LVDS vs True Differential

SERDES 2 LVDS vs True Differential

SERDES video 2 LVDS vs True Differential

DIY: Make a $3 Laser Diode Driver!

DIY: Make a $3 Laser Diode Driver!

How to make a cheap and very easy laser diode driver from parts found at any electronics store. This video is about the most simple it gets, you can add extra parts for more features if you want later. For a detailed tutorial on building this driver with extra features, go here: http://laserpointerforums.com/f42/diy-homemade-laser-diode-driver-26339.html RadioShack Parts list: LM317: http://www.radioshack.com/product/index.jsp?productId=2062601 resistors vary on what you need, resistor kit: http://www.radioshack.com/product/index.jsp?productId=2062304&CAWELAID=107599311 Parts can be bought off the internet for dirt cheap, for the prices I paid for my components, I paid 40¢. w00t 4000 subscribers!

Laser control,Laser driver ,Resistor kits and Capacitor kits

Laser control,Laser driver ,Resistor kits and Capacitor kits

Laser Control .TECA1-XV-XV-D Laser Control http://www.analogti.com/laser-control/ac-laser-driver.html http://www.analogti.com/laser-control.html http://www.analogti.com/laser-control/dc-laser-driver/high-efficiency-laser-driver.html http://www.analogtechnologies.com/document/ATRDB12.pdf http://www.analogtechnologies.com/resistor-box.htm Laser Drivers Selection Guide ATI offers a broad range of laser diode drivers/controllers: AC input laser drivers and DC input laser drivers. The latter includes high efficiency laser drivers, ultra low noise laser drivers, and dual mode laser drivers. Our laser drivers/controllers come with many features, as follows: high efficiency, dual mode, constant current output, constant power control, ultra low noise, high current, and nano seconds pulse width, loop good indication, compact size, etc. Using these laser drivers and controllers along with our TEC controllers enable our customers to design and build high performance low cost diode

Astable Multivibrator Using Transistors (TTL) with Reversing Motor

Astable Multivibrator Using Transistors (TTL) with Reversing Motor

Submitted by: Ellarina, Joanna Marie A. Manrique, Christine R. Quindoyos, Beatrice Nicole R. BS CoE III-1 Submitted to: Engr. R. Oquindo In compliance with the subject Electronics Devices and Circuit Analysis II *Mission Impossible Theme Soundtrack No Copyright Infringement Intended

Clock Driver Pull-up and Pull-down Impedance Termination Affect on Timing Waveforms

Clock Driver Pull-up and Pull-down Impedance Termination Affect on Timing Waveforms

This video describes a case where a clock waveform exhibits overshoot, undershoot, ringing, or stepping, but only on the top or bottom side of the waveform. Unlike cases where the source impedance series resistor can be adjusted to match the transmission line impedance, issues on only one half of the waveform indicate that the pull-up or pull-down impedances of the clock driver are not perfectly matched to the transmission line impedance. If this occurs, users should contact their silicon manufacturer for advice. Presented by Ron Wade, timing expert at IDT. For more information about IDT’s leading portfolio of clock and timing ICs, visit www.idt.com/products/clocks-timing.

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