sci.electronics.design Google Group

Microcurrent plasma tube

2008-12-02T07:54:30Z

What is the lowest power option to ionize a very small plasma tube? IOW I
want to ignite (pulse) a small tube in a 4 x "AA" battery powered device, at
the appropriate voltage, at around 100Hz. The duty cycle of the waveform can
be shorted to conserve battery life, if required. What type of off-the-shelf

7805 regulator input voltage confusion ??

2008-12-02T04:50:18Z

hi, just looking up some specs on the 7805 regulator , one site says a max
of 35vdc input and this says 25vdc max input
([link]) ,,,,,, i`m pretty
sure the max is 35vdc ?
what is correct ?
also i have nearly finished building a fixed and adj power supply all in

Your opinion on bad sound

2008-12-01T20:47:25Z

I like to go clubbing. I've noticed that sometimes the sound quality
is terrible. Distortion like clipping due to using underpowered amps.
I've also noticed that after a night out at these places I get a bad
ringing that lasts for weeks, and it's not just my regular tinnitus,
it's new tones and a weird screeching sound when I listen to everyday

Bipolar +/- 30 V 1 A 1 kHz sine wave amplifier - op amp, voltage controlled power supply, or ??

2008-12-01T19:49:41Z

I need to amplify a sine wave (0.05 to 1 kHz) to +/- 30 Volts at 1
Amp. The output voltage needs to be adjustable and can be
accomplished by varying the input amplitude or circuit gain. I've
considered using an op amp such as the OPA548 but am wondering if
there is a bipolar power supply capable of external voltage control

Microwave diode?

2008-12-01T18:21:36Z

Have simple detector circuit that specifies 1N21B diode. That diode is
20-plus years old and obsolete. Looking for current equivalent, possibly (but
not necessarily) smt.
Are these useable in place of a 1N21B for 2.4 GHz detection?:
<[link]>
<[link]>
Suggestions welcome.

Digital to Analog converter, accuracy, resolution and selection

2008-12-01T18:13:36Z

Hello All,
I have chosen analog devices AD5532HS for my project. The main reason
that I chose this DAC was because of its 32 voltage output channels.
You can find the DAC at
[link]
My post is long and I request you to be patience and helpful. I need

Clamping of the inductive spikes

2008-12-01T16:02:50Z

Recently I have encountered the problem of clamping the voltage spike
on the inductive load. The initial current in the load is about 100A,
the spike voltage slew rate when the load is disconnected is at the
order of 500V/us.
If we clamp the load with a diode, the clamping appears to be not very

solutions manual sale

2008-12-01T15:03:17Z

I have the comprehensive solutions manual for the listed books. If you
want to buy any of them, contact me at medozero73(at)googlemail(dot)
com
Applied Fluid Mechanics (Mott)
Applied Strength of Materials (Mott)
Adaptive Filter Theory (Simon Haykin)
An Introduction to Database Systems (C.J. Date)
Applied Multivariate Statistical Analysis (Johnson & Wichern)

Pinout for 2n4893 in Plastic Package

2008-12-01T06:12:19Z

I'm searching for the pinout for a 2n4893 unijunction transistor, or a
test to identify the pins without blowing up what turned out to be a
18$ part.
Thanks, Steve Roberts

Demand that US presidential electors investigate Obama's eligibility

2008-12-01T04:54:26Z

Remind your US presidential electors about their constitutional duty
to investigate Obama's eligibility before it's too late and the
economic crisis becomes the least of your problems
No FBI, no Secret Service, no Hawaii beaurocrats have ever
investigated Obama's birth in Hawaii to confirm his natural-born US

Using Many Ceramic Chip Capacitors Series vs Parallel

2008-12-01T01:46:30Z

I'm planning on paralleling 50 1uF 200V ceramic chip capacitors.
(Yeah I know that's goofy.. )
__Stress on capacitor pack.__
Vcap.peak = 170V
Ripple current = 3.2Apk
f=120Hz (post rectifier)
Alternatively, 50 47uF 4V capacitors in series cost $$$ about 3x
less..
(Digikey observation.)
[link]

PWM detector?

2008-12-01T01:39:00Z

Hello all,
I am designing an automotive product (operates 9 to 16VDC) that will
drive a regulated high current 10 amp load with a NPN low side drive
transistor. It will maintain average current to the load via PWM
(400Hz 1% to 99% duty cycle) and sense resistor.
My question, I want a way to shut the load down in the event the PWM

Bare PCB mount Banana Jack?

2008-12-01T00:29:44Z

Does anyone know were to get bare PCB mount 4mm Banana Jacks (socket)?
The kind you find when you open a typical digital multimeter, with
just the bare metal shaft.
The usual suppliers and searching aren't bringing up much.
Thanks
Dave.

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2008-11-30T23:12:23Z

[link]
- The best tits in town people for the love of god already these
great pictures and videos wont last long download them while you can !

Radio Mic

2008-11-30T19:11:17Z

I have a speech recognition application where I need (for demo
purposes) to use a radio mic and have the computer speak back via the
speakers. I installed a bluetooth neadset which works brilliantly -
however the computer always sends the audio output to my headset
earphones and not the speakers. Despite the fact I set the sound card