Latest threads in Hobby Electronics Basicsshow only best voted threads
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1N5817 schottky
Hello, I'm about to make a wideband rf sniffer using an op amp and a simple detector front end feeding a capacitor and one of the inputs to the op amp. I could bias the diode near conduction if it...
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15 years ago
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Converting from 30V to 5V or less
I'm using a computer to gather data using LPT1 port. The input pins of the lpt accept 0-5V. I want to know when three utility motors using 30V start and when they end. When a motor starts it gets 30V....
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15 years ago
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Open Instrumentation Project: Newsletter 8
This is Newsletter #8 of the Open Instrumentation Project. The OIP makes open-source software and economical high-technology instrumentation hardware for students, hobbiests, engineers and scientists....
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15 years ago
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Controlling Resistance Digitally - what kinds of components can be used?
Hello All, I've recently posted on another topic, and thanks for the varied replies, which gave me the information I needed. I've another question regarding digital control of resistance. I have an...
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15 years ago
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Part Search for an oscillator
Hi, anybody know of an oscillator or multivibrator than I can crontrol both frequency and duty cycle. I tried to find a chip like the CD4047 but with variable duty cycle. My output needs to be about...
6
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15 years ago
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Increasing PWM output voltage
Hello, I need to boost a PWM signal at 5KHz and 450mV to 5V at 5KHz and 100mA max. Could someone please give me a list of the components I need and a schematic to do this. A suggested idea was this......
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15 years ago
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Anybody used the TC4432 (30v buffer)
Hi, I am trying to use the TC4432. I am doing the exact circuit of page 7 below. My Vdd is at 1v, and my input is coming from a pic chip running at 10khz 60% duty cycle. 7 of microchip What I am...
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15 years ago
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Power Supply for a LM317
I have a 16 Volt, 4 amp wall I wart to use with a LM317 variable power supply. The LM317 can only handle 1.5 amps, but the circuits that I will be testing are rated at less than .5 amps. Will the 4...
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15 years ago
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Call For Papers (The 9th ICCCS 2008)
CALL FOR PAPERS The 9th International Conference on Computers, Communications and Systems Daegu University Korea, November 7, 2008...
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15 years ago
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Potentiometer for CMoy Headphone Amp
I'm building a headphone amp based on the simple CMoy design. I want to add a variable gain and the design shows adding a dual gang pot on the inputs as a potential divider. The design notes say to...
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15 years ago
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Adjusting frequency NE556
Hi, The following is a PDF of a motor control kit... Currently it is designed to run at around 410Hz. I assume that too will be the frequency for the PWM output but I need 5KHz from the PWM. I looked...
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15 years ago
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Driving LCD 7-seg passive displays with PIC
I have a passive LCD with 8 7-seg digits plus point and some other symbol. It has 23 connections. I wish to drive it with a PIC that has LCD module built-in but I have seen that all PICs capable to...
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15 years ago
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Help finding phase angle
I'd appreciate some help with this equation... I've been looking at it for a few days now... Here's the equation: I'm trying to understand how the formula for the phase angle is determined. Thanks for...
3
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15 years ago
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value of Lab-Volt power supply
I have an ac/dc power supply with a DC and a VOM meter. It's fairly large with 3 units stacked together. I couldn't find any model #. Any idea as to it's value?
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15 years ago
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LED Matrix Questions
Hiya folks. I got into electronics mostly as a result of messing with digital components, so unfortunately I still find myself confused when it comes to various analog aspects of circuitry. So I was...
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15 years ago
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