Current Source for Resistance Measurement
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. The supply...
Long Duration Linear Sweep or Ramp Generator
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...
Usage of Schmitt trigger NAND Gates
I have a question about your “Long Duration Timer” circuit, del20017 found here ..Long Duration Timer Clock. You have labeled U1 as a 4093. A 4093 is a NAND with schmitt trigger inputs, yet...
Buffer or Unity Gain Op-Amp
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. Buffers are used as interface between circuits. Low impedance...
Single Digit Voltmeter Improvements
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...
uC Board is Buggy on Brown Out
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. Now what I wish to do is disconect the load when my battery...
Some Cyclic Timer Ideas
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.
RS Latch Erroneously setting by Itself
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. I have capacitors...
An Oscilloscope on your TV
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...
Digital Multimeter 50200 50220 – Energy Concepts
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. Operational...
Hobby Diy Oscilloscope
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. You First need to build the circuit below...
PC Sound Card Oscilloscope
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...
