Latest threads in Hobby Electronics Basicsshow only best voted threads
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Really old homebrew power supply
I have a power supply that I built as one of my first projects when I was in high school, in the mid 1960s, and it has always worked well enough for my needs. It's in a Bud "Portacab" 6" wide, 8"...
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15 years ago
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Phone problems after thunderstorm
I am trying to help my grandmother with a phone problem. I'm not entirely sure what's going on (she's very confusing) but some (possibly all) of the Caller ID displays on her home telephones are...
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15 years ago
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lightning timer
In our house we do have lightning that stops working after a 30 seconds or 1 minute. But for now the timer doesn't work anymore, it's broken. Someone who can help me find that thing on the net. And...
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15 years ago
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Battery charging software
BattChgPro Ver 1.5 Battery charging software Nine types of battery chemistry (Secondary) Lithium, NiCad, NIMH, Lead Acid, Nickel-Iron Nickel-Zinc, Sodium-Sulfur, Zinc-Bromine, Alkaline Select cell...
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15 years ago
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Dialer problem with a picchip
Hello, I have a recuring problem when connecting my circuit to the phone line. basically the circuit I use is : the exception that I connect B3 to an 8th order low pass filter and the output of that...
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15 years ago
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Does anybody know why this would oscillate (LDO)?
Does anybody know why this would oscillate? Schematic 5.1V LDO 2Ma - 15Ma According to the bode plot this loop should be stable (85 deg PM, 74 kHz crossover at 20db/decade). I'm using a 4.7uf ceramic...
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15 years ago
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PIC's and USB
I downloaded some stuff on how to use USB from: I want to make a PIC act as an HID keyboard, but I've come up with a couple questions before I get too deep into this. 1) Most of the schematics I see...
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15 years ago
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PIC - Recommendation for a first time user
Thank you everyone for your input to my earlier thread for my need of a one chip solution that directed my application to using a PIC. As a new PIC learner can you give me a PIC choice & part # (kit)...
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15 years ago
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Comprehensive List of Farm Electrification Ideas
1. The Super Irrigator a. The Super Pivot: tractor wheels powered by an electic motor slide radially and rotate the pivot for spiral furrows. Easiest low tech fully automated field. A conventional...
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15 years ago
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Problem with this circuit
I've found this circuit: gnd------voltage source-----current source------resistor----gnd all sources are ideal I shoud calculate the voltage across resistor....how can i do? A)If i use Kirchhoff...
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15 years ago
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Sound operated light source
I am learning morse code. There are software available which convert any text into morse and give the output to the headphone jack. I was wondering if this sound output at the headphone/speaker jack...
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15 years ago
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Dual Trace Sound Card Scope
SndScopePro 1.5 Dual Trace Sound Card Scope Professional Dual Trace Oscilloscope AC DC Triggered Input Single / Dual channel Volts / DB Digital Readout Time / Frequency Digital Readout Auto Gain...
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15 years ago
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Inverter improvements?
Hello, I have an inverter circuit, although I learn that hooking a load directly to its output is not working. I was not sure if I should use an opAmp or mosfet, I have the circuit below, any...
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15 years ago
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water level relay
I thought this would be easy, but I'm struggling with the details. I have some lights (12VDC 200W) I want to turn on when the water level in a fountain reaches a certain point (i.e., the fountain is...
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15 years ago
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Building Your Own Flyback Transformer
A friend gave me a little yellow toroid (ferrite?) with a winding around it, that he had butchered from some non-working computer part. I unwound the (thick!) wire, re-wound it with 10 turns of...
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15 years ago
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