Electronics Circuits

Here is a current source you can build for resistance measurement. When the current is held constant, you know as per Ohm’s Law the Voltage across Resistor is proportional to Resistance value.

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I hope you can help me with a circuit. Its a voltage sweep circuit that will sweep from 0v to10v in a 45 min time period, I’m using it for an input on a signal generator to control the output frequency.

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I have a question about your “Long Duration Timer” circuit, del20017 found here ..Long Duration Timer Clock. You have labeled U1 as a 4093.

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If output impedance of a point is a high value then connecting another circuit at that point will load it resulting in malfunction or error.

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I would like to improve that circuit of a single digit voltmeter, I want to make it measure voltage from -9 V to +9 V but I don’t have any idea.so would you please give me an idea.

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I’m working on a project which involves battery  Ni-Mh 4×1.2v, 2100mAh], which power-ups the boards. The current consumption is about 150mA.

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A product spec and need from my email archive. This indicates how clarity in customer specs can help him get a working solution with less wastage of time and money.

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I am having trouble preventing my rs latch from erroneously setting. The circuit is a voltage threshold detection circuit with a nand gate whose output is tied to a SR latch.

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Over the last few days I’ve been playing around with an old small black and white tv….I did the infamous “Oscilloscope on your TV” thing that’s all over youtube and the rest of the web…grew bored with that, so I’ve decided I want to make it into a fully-functional scope that I can use in my lab.

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Is it good as a (beginner) hobbyist to crave for an oscilloscope.  mail from EA – This scope will work from your PC Audio Card or Sound Card. 

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I would like to buy a Microphone and either #1. an oscilloscope or #2. sound oscilloscope software. For hobby purposes, I would like to sample different sounds & view the various sound waves studying the amplitudes & frequencies.

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Can you help me to find circuits which uses photo-sensors.and if you do have them, would you please send them to me.

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This is a mains 230V AC load current indicator and is a LIVE CIRCUIT, so take care. The Resistors have to be a fusible ceramic wire wound.

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None of this is specific to a particular microcontroller or family of microcontrollers; it applies equally well to PICs or AVRs or 8051s or any other processor.

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Date: Wed, 30 May 2007 17:00:46 -0400   – Subject: 555 simulator

Hello, I just found and had a chance to play with the 555 simulator over the internet.

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Howdy! This circuit of yours is EXACTLY what I was looking for. TOTALLY cool! However, I have a few questions about it…mostly because I’m a software guy.

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message: from SJ

for my hobby purpose (pewter small models) i ‘m building a kind off rubber press with two hot plate about max: 200degre C.

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This manual provides maintenance information for the Energv Concepts Digital Multimeter, Model No. 50200. Included are circuit board information, the various adjustments required, parts lists, schematic diagram, and other maintenance and troubleshooting information.

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U1 CD4541 is a Timer with Long Duration Ability. This timer is started by a low pulse from earlier circuit, when the temperature goes above setpoint, a low state is at U2A inputs, this starts the timer.

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This is the best Instrumentation OpAmp, Great CMRR, ensure supply has no ripple and keep analog and digital grounds separate.

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