Search found 235 matches
- Thu Jun 23, 2011 6:50 pm
- Forum: General Discussion
- Topic: simple design thermal wattmeter ?
- Replies: 14
- Views: 7895
Re: simple design thermal wattmeter ?
my latest epoxy an LM35 on the output measuring resistor using temp on pure resistive load and reliable power source. input with constant voltage constant current ex:5V @ 10mA directly to the resistor with lm35 so the temp is over ambient. now insert the joule thief and see if the heat rises signifi...
- Wed Jun 22, 2011 1:46 pm
- Forum: General Discussion
- Topic: simple design thermal wattmeter ?
- Replies: 14
- Views: 7895
Re: simple design thermal wattmeter ?
Dyarker, its all good, sometimes we have to be pointed in our post. To Bob Scott, He says according to the BYU fancy state of the art oscilloscope tektronics 3032 it integrated the area under the wave and it says the power is 7.9 times the input. Also there is report that the stinking fancy oscillos...
- Wed Jun 22, 2011 1:28 am
- Forum: General Discussion
- Topic: simple design thermal wattmeter ?
- Replies: 14
- Views: 7895
Re: simple design thermal wattmeter ?
to dyarker The reporter stirling allan may not understand all the technical electronic and physics details, for example it's not cold fusion but muon-catalyzed fusion same difference. a simple search no bs http://en.wikipedia.org/wiki/Steven_E._Jones The scope connection points are in the video take...
- Tue Jun 21, 2011 5:28 pm
- Forum: General Discussion
- Topic: simple design thermal wattmeter ?
- Replies: 14
- Views: 7895
Re: simple design thermal wattmeter ?
Thankyou Robert, The bolometer idea is helpful, there are so many. The compensated thermistor bridge looks promising while other types are possibly too sensitive, the radar type would need some scaling some are very elaborate and expensive at first look it seems complex. I am wondering if an RF type...
- Tue Jun 21, 2011 2:43 am
- Forum: General Discussion
- Topic: simple design thermal wattmeter ?
- Replies: 14
- Views: 7895
Re: simple design thermal wattmeter ?
Maybe I should start over, maybe thermal watt meter is'nt what a replicator needs. For a frequency I see the author Steven Jones tektronix 3032 ch1 3.926 Mhz ch2 37.1 Mhz scope shots http://pesn.com/2011/05/27/9501835_Steven_E_Jones_demonstrates_overunity_circuit/Tektronix_8xOU_79mV_full_redu.jpg It...
- Sun Jun 19, 2011 9:16 am
- Forum: General Discussion
- Topic: simple design thermal wattmeter ?
- Replies: 14
- Views: 7895
simple design thermal wattmeter ?
Hi, I need your help for a design of a thermal wattmeter. It is needed to measure output power of complex waveforms. such as dc pulse, trapazoid, and variants while most of the oscillators are typically 1 inch (49mm) toroid coupled to negative resistor some do do not use NR as load. The the insertio...
- Thu Jun 09, 2011 8:35 am
- Forum: General Discussion
- Topic: Winding a Toroidal Ferrite Core
- Replies: 13
- Views: 6573
Re: Winding a Toroidal Ferrite Core
The square edges could mean it was intended for coating. Always put a radius, dremels work. once or twice around with plummers teflon tape is super. Depending on the end use. For simplicity the larger gauge and gently flatten with small rubber mallet as you go. gaps may not be good Test wrap 10 turn...
- Tue May 31, 2011 5:27 pm
- Forum: General Discussion
- Topic: Secret to using pure carbide drill bits revealed
- Replies: 19
- Views: 8145
Re: Secret to using pure carbide drill bits revealed
my dremel is permanently mounted on an aluminum drill press stand. I added two 1/2 inch round rods mounted upright near the back of the base plate and a hardwood 1 X 2 has two holes for the rods. This reinforces the dremel for straight up and down motion. I rarely break drill bits now unless I come ...
- Sun Apr 24, 2011 7:29 am
- Forum: General Discussion
- Topic: Inductors for Receiver
- Replies: 14
- Views: 15509
Re: Inductors for Receiver
for a lowfer receiver you don't need heavy coil.
there are alot of misguided radio designs on the internet.
there are alot of misguided radio designs on the internet.
- Sat Apr 23, 2011 4:28 pm
- Forum: General Discussion
- Topic: credit cards and plastic bags ???
- Replies: 8
- Views: 6068
Re: credit cards and plastic bags ???
maybe a form of cleaning and deguassing
- Wed Apr 13, 2011 3:24 pm
- Forum: General Discussion
- Topic: 3 Phase 110 VAC 1/4 horse power motor
- Replies: 18
- Views: 9254
Re: 3 Phase 110 VAC 1/4 horse power motor
You can make three phase 117VAC you can use a 4017 and diode mixer or opamps to make a 3 phase signal. rectify the 117VAC feed the signal to appropriate transistors. The reason you don't see too many of these converters is a big 3 phase motor needs to be in phase with 60 hertz vac It has been proven...
- Tue Feb 22, 2011 11:05 pm
- Forum: General Discussion
- Topic: Electrostatic problems
- Replies: 6
- Views: 4837
Re: Electrostatic problems
you could build a sensitive electrometer such as 9V battery jfet led. this is used like a sniffer to find where the buildup is. The fuzzy stuff (static electricity) likes to swarm in and around the inputs. I have had some success by adding small ferrite rings on signal inputs. I sometimes prefer bui...
- Sat Feb 19, 2011 8:07 am
- Forum: General Discussion
- Topic: Automotive back-up alarm circuit
- Replies: 13
- Views: 7158
Re: Automotive back-up alarm circuit
A successful design is one that is functional and is comfortable to listen to for the driver. for some a tone whose intensity increases as the rear bumper approaches some object. An IR light and infra red sensor could be used to do this. Or the good ol ultrasonic emmitter/sensor. The design starts w...
- Mon Feb 14, 2011 12:19 am
- Forum: General Discussion
- Topic: regulated mA
- Replies: 8
- Views: 5110
Re: regulated mA
After using a variable power supply to make adjustments and the project is all trimmed then I try to find a walwart. The old lm317 and 15V 500mA walwart and pot is a minamal standard needed. I think its very handy and worthwhile in project design. most of the 9V I use are 300mA closer to a 9V batter...
- Tue Feb 08, 2011 8:56 pm
- Forum: General Discussion
- Topic: Circuit for keeping voltage below a certain amount
- Replies: 7
- Views: 4530
Re: Circuit for keeping voltage below a certain amount
sorry for having to post twice this forum has the edit function disabled and the FAQ is incoorect !!! time to look for a different forum the series circuit should have a transistor http://www.tpub.com/neets/book7/27k.htm sorry again the edit function is really important to continued success of this ...