Latest threads in Hobby Electronics Basicsshow only best voted threads
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suggest LED + transistor for PC?
I wanted to change the indicator LED a bit. First off, the HD indicator LED is uselessly dim because of a cheap optic guide so I'm going to discontinue that LED and I wanted to use the light bars...
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15 years ago
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tiny inductor with every bypass cap?
Hello, I was looking at the schematics for a DSP-based board, running at 100 MHz. They have a tiny inductor with every bypass cap around the DSP. Do you think this is necessary? This DSP has analog...
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15 years ago
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53 | |
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op-amp nV input offset voltage
Hi, As you know, the *input* offset voltage is the voltage required across the op-amp's input terminals to drive the output voltage to zero. Although it has been my experience that for most op-amps...
1
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15 years ago
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1 | |
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The Right PCB House
Hello, I need to have a 4-layer board made, a prototype, 2 boards, nothing fancy. I did some research in this newsgroup and I narrowed it down to Sierra Pro Express, ExpressPCB, and AC Advanced...
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15 years ago
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44 | |
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a PC Based Oscilloscope?
Hello, My company wants to buy an oscilloscope. The scope that meets our needs is around $7,000. I am sure we can save much money if we buy a PC-based unit, like Picoscope. Do you have experience with...
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15 years ago
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29 | |
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pulsed DC and transformers
I'm trying to figure out if I could drive a transformer with pulsed DC, and have it work (not saturate, overheat, etc.) Ideally I'd like to pulse a self-wound toroidal transformer with 12VDC, on the...
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15 years ago
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16 | |
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which oscilloscope?
Hello, My boss asked me to evaluate oscilloscopes and to recommend one. I know Tektronix and LeCroy. Which is better? Are they any others? Ideally, we would get a 4-channel scope at 300 MHz, with a 5...
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15 years ago
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46 | |
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learning about transistor equivalent to R_ds_on
In this data sheet for the TIP31A: The spec is given: VCE(sat) * Collector-Emitter Saturation Voltage IC = 3A, IB = 375mA: 1.2 V Does this mean then that the resistance between the collector and...
7
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15 years ago
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How to optimize parameters for making a coil with high-Q?
I want to make a simple coil (inductor) with a Q value as high as possible. Now, I would like to know if there are simple guidelines on how to choose the parameters to obtain this. Parameters are: -...
9
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15 years ago
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9 | |
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voltage question
Hi, I'm a newbie and wanting some advaice. I just purchased a multi-meter and was wondering when I check the charge or voltage of a 1.5 battery, do I place the switch selector to DCV on 2000m or do I...
10
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15 years ago
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load device
I have succeeded in building the Led timer. Two used 9v batteries outputting 13-15 v, are timed via a 555, to light up the led for about a minute. However, if the led is replaced with a load device,...
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15 years ago
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Surge protectors to use with home electronics when grounding is not available?
I am moving into a home which was built in the late 1800s where brownouts are common and no grounds are available on the outlets. I will not have the option of rewiring the home. Does anyone have...
98
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15 years ago
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98 | |
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Soldering onto NiMH batteries?
Hello all, I've only done a little soldering before, but I want to rebuild a battery pack for my TI-59 calculator (which is basically 3 AA-sized batteries soldered together in series). Can I just...
13
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15 years ago
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13 | |
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Valve preamp
I have found a valve preamp kit in an online store, to go between an amplifier based on an LM380 chip, and a crystal or regen radio, but it uses a microphone where I want an audio input. If anyone can...
8
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15 years ago
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electronics circuit & electrical
i need circuit of dc/ac inverter
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15 years ago
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