Search found 235 matches

by Dimbulb
Thu Jun 23, 2011 6:50 pm
Forum: General Discussion
Topic: simple design thermal wattmeter ?
Replies: 14
Views: 2572

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...
by Dimbulb
Wed Jun 22, 2011 1:46 pm
Forum: General Discussion
Topic: simple design thermal wattmeter ?
Replies: 14
Views: 2572

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...
by Dimbulb
Wed Jun 22, 2011 1:28 am
Forum: General Discussion
Topic: simple design thermal wattmeter ?
Replies: 14
Views: 2572

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...
by Dimbulb
Tue Jun 21, 2011 5:28 pm
Forum: General Discussion
Topic: simple design thermal wattmeter ?
Replies: 14
Views: 2572

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...
by Dimbulb
Tue Jun 21, 2011 2:43 am
Forum: General Discussion
Topic: simple design thermal wattmeter ?
Replies: 14
Views: 2572

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...
by Dimbulb
Sun Jun 19, 2011 9:16 am
Forum: General Discussion
Topic: simple design thermal wattmeter ?
Replies: 14
Views: 2572

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...
by Dimbulb
Thu Jun 09, 2011 8:35 am
Forum: General Discussion
Topic: Winding a Toroidal Ferrite Core
Replies: 13
Views: 2182

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...
by Dimbulb
Tue May 31, 2011 5:27 pm
Forum: General Discussion
Topic: Secret to using pure carbide drill bits revealed
Replies: 19
Views: 2700

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 ...
by Dimbulb
Sun Apr 24, 2011 7:29 am
Forum: General Discussion
Topic: Inductors for Receiver
Replies: 14
Views: 3514

Re: Inductors for Receiver

for a lowfer receiver you don't need heavy coil.
there are alot of misguided radio designs on the internet.
by Dimbulb
Sat Apr 23, 2011 4:28 pm
Forum: General Discussion
Topic: credit cards and plastic bags ???
Replies: 8
Views: 1774

Re: credit cards and plastic bags ???

maybe a form of cleaning and deguassing
by Dimbulb
Wed Apr 13, 2011 3:24 pm
Forum: General Discussion
Topic: 3 Phase 110 VAC 1/4 horse power motor
Replies: 18
Views: 3307

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...
by Dimbulb
Tue Feb 22, 2011 11:05 pm
Forum: General Discussion
Topic: Electrostatic problems
Replies: 6
Views: 1568

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...
by Dimbulb
Sat Feb 19, 2011 8:07 am
Forum: General Discussion
Topic: Automotive back-up alarm circuit
Replies: 13
Views: 2626

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...
by Dimbulb
Mon Feb 14, 2011 12:19 am
Forum: General Discussion
Topic: regulated mA
Replies: 8
Views: 1928

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...
by Dimbulb
Tue Feb 08, 2011 8:56 pm
Forum: General Discussion
Topic: Circuit for keeping voltage below a certain amount
Replies: 7
Views: 1596

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 ...