Will a Gas Operated Generator Work?

Started by mea305 in sci.electronics.basics11 years ago 2 replies

Concerning the use of the macerator, would a gas-powered generator work? There is a receptacle for 12 VDC, and on the bottom of the outlet, it...

Concerning the use of the macerator, would a gas-powered generator work? There is a receptacle for 12 VDC, and on the bottom of the outlet, it appears that the outlet produces 8Amps (designated with 8A). If this unit works, will it be safer than using the DC power supply with an automotive battery? Thanks, Mark


Bridge Rectifier Problem.......!!!!!!!

Started by jo.jo in sci.electronics.basics11 years ago 21 replies

I am trying to construct a small desktop power supply and have noticed a small problem when measuring the output voltage from my...

I am trying to construct a small desktop power supply and have noticed a small problem when measuring the output voltage from my bridge rectifier. The rectifier is constructed from four 1N4001. When i apply a AC wave (sin) to the input and measure the output, using a oscilloscope, the bridge rectifier seems to produce only halfwave rectification. I was expecting full wave rectification. ...


timed igniter for metal halide lamps

Started by kfel in sci.electronics.basics11 years ago 12 replies

Hello, Could anyone help me with designing a timed igniter for metal halide lamp which stops providing pulses to the lamp after 10mins. The...

Hello, Could anyone help me with designing a timed igniter for metal halide lamp which stops providing pulses to the lamp after 10mins. The circuit that i tried is described below: - Step 1A: Setup a power supply for the 555 from the ac mains using a bridge rectifier Step 1B: Setup a 555 timer in the monostable mode with a pulse duration of 10mins which resets on poweron Step 2: C...


why did it break

Started by randomname in sci.electronics.basics11 years ago 9 replies

i took a 12v 300ma transformer (meant for a little submersible pump) and cut the wire and stripped it. then i used it as a power supply for a...

i took a 12v 300ma transformer (meant for a little submersible pump) and cut the wire and stripped it. then i used it as a power supply for a simply 555 circuit with about 10 LEDs strobing... for some reason they were strobing a lot faster than with the 6v batteries id been using, so i start switching resistor values. eventually, the transformer just died. why did this happen? whats di...


Variable DC power supply

Started by Stumpy in sci.electronics.basics11 years ago 4 replies

I'm planning on testing a house light dimmer switch to provide

I'm planning on testing a house light dimmer switch to provide


Drive logic/motor power supply

Started by FyberOptic in sci.electronics.basics11 years ago 8 replies

Hiya, I was considering adding either a floppy and/or hard drive into a project I'm working on, and since either requires 12v to run the motors,...

Hiya, I was considering adding either a floppy and/or hard drive into a project I'm working on, and since either requires 12v to run the motors, I got to wondering about something. Are the logic and motor components of such a drive totally isolated from one another? I mean, if I want to power the logic board of a drive from the power source of the project itself, but I want to power the mot...


Need simple 50V output stage for 4Mhz function generator

Started by royalmp2001 in sci.electronics.basics11 years ago 6 replies

I have a function generator that gives out upto 10V (0.1Hz to 4MHz). Need to add a simple output stage to provide upto 50V for this bandwidth...

I have a function generator that gives out upto 10V (0.1Hz to 4MHz). Need to add a simple output stage to provide upto 50V for this bandwidth (will provide dedicated power supply). Any suggestions for the configuration?


Quick LED question

Started by Jason S in sci.electronics.basics11 years ago 24 replies

I want to connect 8 white high brightness LED's together. What is the safest way to connect them? I've thought about 1 resistor per LED, but...

I want to connect 8 white high brightness LED's together. What is the safest way to connect them? I've thought about 1 resistor per LED, but is it really necessary if all the LEDs have the same specs and power requirements? I want to save as much room on my PCB as possible. Power supply = 12V DC LED type = White, 7000mcd, 3.5V Forward V, 30mA typical current. If I connect them all i...


Is 12V power source OK?

Started by shrdlu in sci.electronics.basics11 years ago

My Garmin GPS runs either on six AA batteries or a plug-in to a car's cigarette lighter. Rather than unning down the NiMHs, I'd like to...

My Garmin GPS runs either on six AA batteries or a plug-in to a car's cigarette lighter. Rather than unning down the NiMHs, I'd like to work with the GPS at home using an independent power supply. I have a 6/12 volt battery charger that charges at a 1amp rate and a stand alone socket that can accept the car plug. Is this risky? BTW-would it be more risky to run with the charger or with a left...


How to calculate a battery capacity

Started by Simon Dice in sci.electronics.basics11 years ago 9 replies

I'm working on a project in wich I need to have a system running 24hrs a day , power supply will be solar panels feeding a battery. Can any one...

I'm working on a project in wich I need to have a system running 24hrs a day , power supply will be solar panels feeding a battery. Can any one share with me formulas on how to calculate de Amp/hr for the battery and the power of the solar panel? Systems will consume average 80watts and need to keep running on a few clowdy days as well. Thanks for the assistance!


Choosing voltage opamp

Started by Vitaliy in sci.electronics.basics11 years ago 28 replies

Hello, I'm looking to add the 2nd stage to photodiode transimpedance amplifier. All I want to achieve by 2nd stage is voltage gain...

Hello, I'm looking to add the 2nd stage to photodiode transimpedance amplifier. All I want to achieve by 2nd stage is voltage gain and capability to drive 50 Ohm loads. The first stage is OPA657. 1) a) Given power supply for opamp +-5V, should I select the opamp that has Io,max=> 200mA. I do expect Vpeak-to-peak,output to be 10V. b) Is that output current achievable only at maximum sup


ULN2803A (darlington array) anyone know what I'm doing wrong?

Started by Ben in sci.electronics.basics11 years ago 14 replies

Applying 5V to the inputs (power supply is also 5V), I'm only getting 0.6V at the outputs. I thought it was a faulty chip, or perhaps damaged...

Applying 5V to the inputs (power supply is also 5V), I'm only getting 0.6V at the outputs. I thought it was a faulty chip, or perhaps damaged while soldering, but I've tried another one in a holder and got the same result. What could be causing this?


NAND output saturation and malformed signal from LP filter

Started by Amanda Robin in sci.electronics.basics11 years ago

I am breadboarding an amplifier/LP filter circuit using an INA125 instrumentation amp, ECS 1 MHz clock to generate signal for the filter...

I am breadboarding an amplifier/LP filter circuit using an INA125 instrumentation amp, ECS 1 MHz clock to generate signal for the filter cutoff, a NAND gate to boost the clock output (thanks to Don Bruder for explaining this in an earlier post), and a Maxim 281 Bessel LP filter. The amp is powered at +- 15 V (using the breadboard's power supply), and I am using LM7805 and 7905 voltage re...


can the input be applied before the V+ in analog switch?

Started by tempus fugit in sci.electronics.basics11 years ago

Hi; Still working on the analog switch issue here. I'm thinking of using a MAX4661 to replace a relay in a switching unit. The relay switches...

Hi; Still working on the analog switch issue here. I'm thinking of using a MAX4661 to replace a relay in a switching unit. The relay switches 15v from float to ground (at 0.15mA). I've been reading the data sheet: http://datasheets.maxim-ic.com/en/ds/MAX4661-MAX4663.pdf and on p.7 it talks about power supply sequencing. I'm new to these devices, so I just want to make sure I understand...


Determing Power Supply pinouts, part 2

Started by Uriah in sci.electronics.basics11 years ago 6 replies

I posted a message earlier about a piece of test equipment that didn't come with the power supply and I got some very good feedback. But as you...

I posted a message earlier about a piece of test equipment that didn't come with the power supply and I got some very good feedback. But as you know you can't take a chance with voltages or I will end up damaging the whole thing. It has a a custom chip and two eproms in it so I could very well turn this thing into junk of which I am quiet capable. Moving on: Is there a general rule whe...


Connection Car Radio to a computer Power Supply ?

Started by Anonymous in sci.electronics.basics11 years ago 5 replies

Hey ! I'm trying to do that thing and I don't even know if it is possible ... Powering a car radio with a computer power supply ? - The...

Hey ! I'm trying to do that thing and I don't even know if it is possible ... Powering a car radio with a computer power supply ? - The Radio is powered by those : http://membres.lycos.fr/menusia/radio/DSC00796.JPG - Power Source from the 'inside' ( Sorry, not very clear ) http://membres.lycos.fr/menusia/radio/DSC00797.JPG For 1 Connector : "its actually 3 pins in the middle (white...


Lowering PS from 15 VDV to 12VDC

Started by Uriah in sci.electronics.basics11 years ago 7 replies

I finally found out the power supply requirements of my ITS 2000S. It is +12VDC, -12VDC, +5VDC. I found a PS that is close but puts out 15VAC...

I finally found out the power supply requirements of my ITS 2000S. It is +12VDC, -12VDC, +5VDC. I found a PS that is close but puts out 15VAC and -15VDC and 5 VDC. If I want to lower this 15 V down to 12 how would I do this? Just put a resistor in line with it? Is it that smiple? Can someone walk me through this so I don't fry this thing. Once more thank you. Russ


Power supply question

Started by Dan Beck in sci.electronics.basics11 years ago 2 replies

Hello all, the AC adaptor for my 4 year old Toshiba portable DVD player died. The specs on it list 12 VDC, 2 amps. Looking through the...

Hello all, the AC adaptor for my 4 year old Toshiba portable DVD player died. The specs on it list 12 VDC, 2 amps. Looking through the Mouser catalog I can certainly find these specs, but I do not know if I need a "regulated" supply, or a "switching" supply. I recognize these questions are freshman EE level, but could someone advise me as to what would be the best solution? The orig...


Switcher impulse noise reduction...

Started by Dave in sci.electronics.basics11 years ago 5 replies

Does anyone have any experiance removing the switching noise from the output of a switch mode power supply? I have tried in vain but...

Does anyone have any experiance removing the switching noise from the output of a switch mode power supply? I have tried in vain but think there is a way to actively filter it out somehow. We're talking about a 20mv peak to peak noise spike at ~ 60 KHz or so. A picture is worth a thousand words but I cant see a way to attach one in this group. Any help would be great! I tried this circui...


i need to build a 13.8 powersupply

Started by Anonymous in sci.electronics.basics11 years ago 8 replies

Hello, i need to build a powersupply, i know how to regularize the ac current . but i need to know how i make a 13.8 volt power supply with at...

Hello, i need to build a powersupply, i know how to regularize the ac current . but i need to know how i make a 13.8 volt power supply with at least 20 amps. at the shop, they have a 24 volt transformer (plus12 minus12) with 10 amp. how i fit this ? And can i fit two power supply to addition the current amp ? Thx in advandce