Latest threads in Hobby Electronics Basicsshow only best voted threads
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connecting a 4" speaker to headphone out of a tablet pc directly-will it harm?
I have a chinese made android tablet pc which has useless onboard speakers. I connected headphones to the hp out jack of the pc and the sound was pretty good. Now I wanted a larger sound so I...
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13 years ago
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measuring ac wattage from ampere
Hi I am in india where the AC mains supply is 220 v 50hz. Now I have a device which has a rating of 1 amp. How do measure its wattage? On the net I read that one has to consider the power factor which...
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13 years ago
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WTB: Heathkit ID-4801 EPROM Programmer
Looking for a Heathkit ID-4801 EPROM Programmer. Thanks, Tim
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13 years ago
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93 | |
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Operatng a remote control remotely!
Hi, I have a remote control that opens the garage doors when a button is pressed. I wish to do this remotely so have shorted the appropriate button and a voltage will be applied across the battery...
6
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13 years ago
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Tilt Switches
I have tried both ball bearing and mercury tilt switches. So far, both have kind of a stutter. That is, when you tilt them, the circuit is closes, opens momentarily, then is closes again. I really...
6
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13 years ago
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LM723 Based Power Supply
Hi Everybody, I need to build my own power supply. I need a proven circuit for 0 to 30V DC variable power supply with minimum 2.5 A current output. I thought I had hit on something good here: But...
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13 years ago
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how to remember (visualize?) the flow of a DECFSZ instruction
In experimenting with pics, (and probably other micros) one of the often used instructions is DECFSZ, often followed by a goto (or even pair of them) to get the program to branch as desired. I always...
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13 years ago
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LTSpice is easier now
A couple things you can do to make life easier when using the excellent LTSpice simulator: 1) When you're happy with your equation in the Expression Editor copy and paste it into the schematic with a...
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13 years ago
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value of the resistence
Small signal voltage gain by one small resistance connected to emitter through a large by passed resistance and junction to base resistance for negative FB. If small R is 0.22K and Rc=10K. What should...
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13 years ago
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model parameters in LT Spice
I've just started using the free version of LT Spice and haven't had a problem doing simulations as long as the components are in the library. Now I need to do a simulation using a component that's...
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13 years ago
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Input Impedance OpAmp Circuit
Hello, I'm trying to figure out what the input impedance to this op-amp circuit is. I have 2 ways I've been thinking about this, and I'm not sure which one is right, or if they're both wrong. I'm...
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13 years ago
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Fast Recovery Diode
Hi Everybody, Could someone please explain the use of a Fast Recovery Diode? I am particularly interested in: 1. How is this diode different from a regular rectifier diode. 2. The role of these diodes...
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13 years ago
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headphone audio output voltage range
Does the audio output voltage swing negative, or does it stay positive? Put another way, does the output waveform look like this (view in fixed font): __ __ / / / / -------------/----- 0 V / __/ or...
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13 years ago
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Pspice of a RC circuit in parallel
Hello, I'd like to monitor the Capacitance and the Resistance as a function of DC bias when a sinusoidal voltage (that has a DC offset) is applied at constant frequency on a RC circuit in parallel....
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13 years ago
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trying to build a simple Class D circuit
After thinking about the overheating of output transistors in a Class AB scheme, I decided to try instead to build a Class D amplifier, with about 1 W of output (powered by a 12V supply). Yes, I know...
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13 years ago
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