A friend wanted to make a DC-DC converter for his daughers' science project, which involves making an LED torch out of a hand-held Peltier...

A friend wanted to make a DC-DC converter for his daughers' science project, which involves making an LED torch out of a hand-held Peltier tile. I suggested he look into the Joule Thief, which he did. He says it works, but he'd prefer for it to work at 0.3V instead of 0.7V. I then remembered the germanium transistors. When he asked where to find one, I realized they're so old they don't ...

Anyone know the maximum frequency of a Heathkit SM-118A? I have been all over Google with little luck. One guy said it would go to 1 GHz...

Anyone know the maximum frequency of a Heathkit SM-118A? I have been all over Google with little luck. One guy said it would go to 1 GHz maybe 2 GHz, I don't think so. Mikek

On popular request, 74HCU04 Spice Model rescued from 1993 archives and posted on the Device Models & Subcircuits page of my website... ...

On popular request, 74HCU04 Spice Model rescued from 1993 archives and posted on the Device Models & Subcircuits page of my website... ...Jim Thompson -- | James E.Thompson | mens | | Analog Innovations | et | | Analog/Mixed-Sign

Seems to be a hot day for HC4046 model requests. And sending the model out by E-mail has resulted in mucho bouncing... seems they think it's a...

Seems to be a hot day for HC4046 model requests. And sending the model out by E-mail has resulted in mucho bouncing... seems they think it's a security threat > :-} So go to.... This is just the VCO portion. Just treat it like a subcircuit to use in whatever simulator you want. For hints/tricks on subcircuit usage, see these

I don't know very well how adc works, so i have a question. Most adc have a Vref pin that defines Vin range of adc. Vin range of adc is then...

I don't know very well how adc works, so i have a question. Most adc have a Vref pin that defines Vin range of adc. Vin range of adc is then divider for 2^n (n=resolution) to obtain LSB. If i resize Vref, new Vin range (smaller) is divided for 2^n, so LSB has smaller value.If i have a sensor, why i shoud use amplifier to drive Vin pin of adc?can i resize Vref as i like (or there is a limit)? ...

If you have be stalled when confronted with a device model specified by S-Parameters, you should read the following collection...

If you have be stalled when confronted with a device model specified by S-Parameters, you should read the following collection of AppNotes... "CreateS-ParameterSubcircuitsForSpice.pdf" now posted under the "Tools" section of the "Simulation Tools & Macros" page of my website... Also just posted there, but only of interest to those who de

1. If I shorted the +5V and +12V in the molex connector, would I get +17V? What's the max. current? 2. Could I use 17V to charge a...

1. If I shorted the +5V and +12V in the molex connector, would I get +17V? What's the max. current? 2. Could I use 17V to charge a notebook battery rated 16V and 3.8A? Would it hurt the battery? -- @~@ Remain silent. Nothing from soldiers and magicians is real! / v \ Simplicity is Beauty! May the Force and farces be with you! /( _ )\ (Fedora 18 i686) Linux 3.9.6-200....

Hi, I have recently been trying to get 1.5 volts (or anything other than th= e power supply's rated 3 volts for that matter) out of a wall-wart 3...

Hi, I have recently been trying to get 1.5 volts (or anything other than th= e power supply's rated 3 volts for that matter) out of a wall-wart 3 volt p= ower supply. The wall-wart power supply is dc in output at 3 volts and even= if I connect a 300 ohm resistor in series with the wall-wart power supply = and the load (a 1.5 volt clock, old style analog clock)and when i measure t= he voltage...

Just recently purchased a house and it has a whole house fan. Unfortunately, the folks who installed the A/C disconnected the motorized louvers...

Just recently purchased a house and it has a whole house fan. Unfortunately, the folks who installed the A/C disconnected the motorized louvers to get into the crawl space a couple months ago and I'm not sure exactly how it was wired. In the crawl space there is a black (which had a wire nut on it) and bare wire and a white wire which looks like it was curled up to not use it (it is not stri...

I see the term bootstrapping, used when the designer wants a high impedance and usually low capacitance. I know it involves feedback but that's...

I see the term bootstrapping, used when the designer wants a high impedance and usually low capacitance. I know it involves feedback but that's all I know. I want to learn enough to build a bootstrapped input with 10Meg/2pf impedance. Those are ballpark numbers, the end use would be used to measure voltage on a high Q coil and NOT load it. Frequency 100khz up to 2Mhz, but 10 Mhz adds mor...