Amplifier for frequency generator

Started by Goran in sci.electronics.basics7 years ago 14 replies

Hi. Im making one simple mcu based device that will work as electronic repellent. Nothing special. Only difference is that i want to check...

Hi. Im making one simple mcu based device that will work as electronic repellent. Nothing special. Only difference is that i want to check other frequency ranges and to do so, i have to connect my device to function generator ( 0 - 4 MHZ ). Does someone knows how to build amplifier for this function generator ?


Generator harmonics question(s)

Started by Anonymous in sci.electronics.basics2 years ago 3 replies

Years ago I adjusted a neighbor's generator so that it put out 60 cycles at 120 volts. I used a TEK 465B 'scope to look at the frequency. I...

Years ago I adjusted a neighbor's generator so that it put out 60 cycles at 120 volts. I used a TEK 465B 'scope to look at the frequency. I saw the major 60 cycle waveform and then a lot of smaller waveforms at higher frequencies. I was told that these harmonics were typical of small generators. Today I am replacing the voltage regulator on a small generator and adjusting the governo...


4017A function generator -Finding resistance values

Started by Brigitte Gaudet in sci.electronics.basics8 years ago 12 replies

Hello, My 4017A function generator just died on me today. I opened it up and saw two badly burnt resistors. I would like to replace them but I...

Hello, My 4017A function generator just died on me today. I opened it up and saw two badly burnt resistors. I would like to replace them but I do not know their values. How can I get the schematic for the 4017A function generator? or anybody has this model and can tell me their values? R624 and R148. thank you for your help. ken


Op-Amp Sawtooth Generator

Started by Patrick Chung in sci.electronics.basics6 years ago

Op-Amp Sawtooth Generator is unavoidable part of PWM modulators and so part of analog control circuits. Now it can be...

Op-Amp Sawtooth Generator is unavoidable part of PWM modulators and so part of analog control circuits. Now it can be simulated: http://www.cirvirlab.com/simulation/op-amp_sawtooth_generator_miller_integrator_simulation.php Also read the theory of operation: http://www.cirvirlab.com/index.php/tutorials/135-op-amp-sawtooth-generator-miller-integrator.htm l


Aldi 59 petrol generator and television

Started by D. T. Green in sci.electronics.basics8 years ago 73 replies

On just buying a 800 watt 'two' stroke petrol generator from Aldi, we have heard from someone who says that he has got one; and that his is...

On just buying a 800 watt 'two' stroke petrol generator from Aldi, we have heard from someone who says that he has got one; and that his is running very roughly, and is really noisy. Also it says in the instructions that it is *not* suitable for connecting to televisions or other sensitive electronic equipment. Has anybody any experience with one of these very cheap generators ? (Only ...


Hendershot Generator

Started by GM Forsythe in sci.electronics.basics6 years ago 6 replies

I've received an ad for plans for a Hendershot generator, claiming that it will produce power sufficient to run an entire house for virtually...

I've received an ad for plans for a Hendershot generator, claiming that it will produce power sufficient to run an entire house for virtually nothing. I find this hard to believe, but I'm not current in my understanding of the physics of this device. Can someone here explain how this works and explore the possibility of using it to power a household? -- +---------[ SERVER SIGNATURE ]-----...


Multimeter and Signal Generator

Started by Anonymous in sci.electronics.basics5 years ago 5 replies

Hi, I am using the following multimeter http://www.repeater-builder.com/radio-shack/22-812/22-812-operating-manual-en.pdf My questions...

Hi, I am using the following multimeter http://www.repeater-builder.com/radio-shack/22-812/22-812-operating-manual-en.pdf My questions is that what is its input resistance or impedance of this meter? -------------------------------------------------------------------------------- I am also trying to find the output impedance of the following signal generator, page 12. I do not ...


Filtering generator output?

Started by Anonymous in sci.electronics.basics6 years ago 7 replies

I have a 4500 watt generator that is for emergency use. When it was new I checked the output with an oscilloscope just to see how pure the sine...

I have a 4500 watt generator that is for emergency use. When it was new I checked the output with an oscilloscope just to see how pure the sine wave was and how close to 60 Hz it was. Well, the main sine wave looked good and the frequency was very close to 60 Hz. It floated around a little as the load changed but then would stabilize very close to 60Hz. However, there were lots of other small...


Efficient Actuators for Alpha Stirling

Started by Bret Cahill in sci.electronics.basics3 years ago 4 replies

The goal is an Stirling w/o a mechanical crank/flywheel. Instead it'll have 2 electric actuators and a linear generator. Supposedly a linear...

The goal is an Stirling w/o a mechanical crank/flywheel. Instead it'll have 2 electric actuators and a linear generator. Supposedly a linear generator, a glorified shake light, can be 95% efficient. I need an actuator that is pretty efficient as well. The actuators need a to consume less than 100 watts and have a stroke of ~ 15 cm. Since it is only for demonstration purposes it is OK if...


Function Generator Sinewave distortion?

Started by Bill Bowden in sci.electronics.basics5 years ago 16 replies

I have an old function generator that has 6 pots to adjust the shape of the sinewave for minimal distortion I don't have a distortion analyser...

I have an old function generator that has 6 pots to adjust the shape of the sinewave for minimal distortion I don't have a distortion analyser so I was thinking of using a DIY sinewave oscillator through a filter to arrive at a good reference and then compare the waveforms on a scope in the add mode and adjust the pots so they cancel out indicating minimum distortion. Problem is, I can...


Tesla generator

Started by Roger in sci.electronics.basics8 years ago 1 reply

Has anyone actually made one of these out of four diodes and four capacitors. If so how much aerial is needed and what voltage was obtained? R

Has anyone actually made one of these out of four diodes and four capacitors. If so how much aerial is needed and what voltage was obtained? R


Huh? Since When--?

Started by Ron Hubbard in sci.electronics.basics8 years ago 48 replies

I use the Exar XR2206 function generator in a lot of my projects but now I see-- at least according to Mouser-- that the IC has become obsolete?...

I use the Exar XR2206 function generator in a lot of my projects but now I see-- at least according to Mouser-- that the IC has become obsolete? Since when? Why? How can such a useful chip become discontinued? This not right! Ron


Rigol DSA 815

Started by Charles in sci.electronics.basics7 years ago 27 replies

This is a moderately priced spectrum analyzer covering 9 kHz to 1.5 Ghz with a tracking generator option. If you do RF, check it out. No...

This is a moderately priced spectrum analyzer covering 9 kHz to 1.5 Ghz with a tracking generator option. If you do RF, check it out. No affiliation with Rigol. None. Nada.


Refected Power

Started by Cursitor Doom in sci.electronics.basics4 years ago 40 replies

Not really a "basic" question, but here goes: I'm just reading up on the subject of power factor in electrical supply lines and how as the PF...

Not really a "basic" question, but here goes: I'm just reading up on the subject of power factor in electrical supply lines and how as the PF heads down towards zero (as the phase difference between i and v gets more pronounced) more and more power is returned to the generator and how this can be fixed by adding capacitance or inductance in parallel with the load. This struck me as i...


HP 3325A Function Generator crapped out

Started by Ecnerwal in sci.electronics.basics5 years ago 6 replies

My HP3325A has moved from "working fine" to "brief flash of the LEDs when the power button is pushed, then all goes dark" - and no indication...

My HP3325A has moved from "working fine" to "brief flash of the LEDs when the power button is pushed, then all goes dark" - and no indication that things are behaving other than the displays (ie, blind button punching does not get outputs.) I have the manual and will work though it, but thought I'd ask if there were any common issues that folks were aware of that I should look for fir...


Advice please about which frequency generator to buy

Started by Anonymous in sci.electronics.basics4 years ago 8 replies

To All, Several years ago I was looking here for advice about buying an oscilloscope. The unit that got the most votes for my price range...

To All, Several years ago I was looking here for advice about buying an oscilloscope. The unit that got the most votes for my price range and experience was the Tek 465B. So I bought one and then later someone who used to post here sent me the meter kit that Tek used to sell and I installed it on the 'scope. The 'scope is way more than I need and so it has never let me down. Now I think I co...


What does this circuit do?

Started by Stumpy in sci.electronics.basics5 years ago 21 replies

If anything. http://reliablehomeenergy.net/wp-content/uploads/2015/03/scheme.png They claim that $49 for instructions, $63 for parts get you...

If anything. http://reliablehomeenergy.net/wp-content/uploads/2015/03/scheme.png They claim that $49 for instructions, $63 for parts get you a single home "magnetic energy generator" designed by Tesla. http://reliablehomeenergy.net/tl I assume the video has an AC coil under the table.


"Random" Circuit Needed.

Started by Jim Thompson in sci.electronics.basics4 years ago 136 replies

For a simulation situation I need a random number generator with a twist... What I need to simulate is a "random" selection of one-of-16...

For a simulation situation I need a random number generator with a twist... What I need to simulate is a "random" selection of one-of-16 outputs. Clock "speed" is 12.5kHz ;-) Built of 74HCxx parts is preferred... I have a full ensemble of those device in my PSpice library. Thanks in advance. ...Jim Thompson -- | James E.Thompson ...


Erratic sinewave signal generator?

Started by Bill Bowden in sci.electronics.basics6 years ago 4 replies

I have a Novatech 2901A 32Mhz synthesizer that increments in steps of 1Khz = with digital readout from 200Khz to 32Megs. It's a cute little unit...

I have a Novatech 2901A 32Mhz synthesizer that increments in steps of 1Khz = with digital readout from 200Khz to 32Megs. It's a cute little unit but occ= asionally gets locked up with a grossly distorted waveform and no frequency= control. It does a self test when turned on and usually works fine, but so= metimes doesn't boot up right, and other times goes into a spasm when I dis= connect or...


classroom Van der graaff generator

Started by szczepan bialek in sci.electronics.basics4 years ago 18 replies

https://pl.wikipedia.org/wiki/Plik:Van_de_graaf_generator.svg There are the positive charge on the sphere. But in the another description we...

https://pl.wikipedia.org/wiki/Plik:Van_de_graaf_generator.svg There are the positive charge on the sphere. But in the another description we can read: ""Although they look simple at first glance, the belt, combs, and rollers invisibly combine to form an electrostatic device called a Continuously Operating Electrophorus". From: http://amasci.com/emotor/belt.html "On average, the nega...