Electronic Circuits Projects Diagrams Free - Electronic Projects Design/Ideas/Reviews http://www.electro-tech-online.com/ Are you building an electronic project or want to? Maybe you need some assistance? Come and submit your electronic questions here and let our experienced members find a solution. en Fri, 20 Nov 2009 20:58:19 GMT vBulletin 60 http://static.electro-tech-online.com/images/misc/rss.jpg Electronic Circuits Projects Diagrams Free - Electronic Projects Design/Ideas/Reviews http://www.electro-tech-online.com/ electric touch- negative ion generator http://www.electro-tech-online.com/electronic-projects-design-ideas-reviews/100286-electric-touch-negative-ion-generator.html Fri, 20 Nov 2009 20:51:11 GMT i'm creating a project known as pikashoes, electric touch, or electrifried

it requires a 12 vdc negative ion generator, however this item is difficult to obtain without overpaying or paying for expensive shipping online.
Anyone know where i'd be able to get a negative ion generator operating at 12 vdc??
Or anyone know what common household product or easy to obtain product without going online i could utilize and yank out the negative ion generator from?? ]]> Electronic Projects Design/Ideas/Reviews xkhplaya http://www.electro-tech-online.com/electronic-projects-design-ideas-reviews/100286-electric-touch-negative-ion-generator.html prolong halogen lamp life (burns from 240V AC) http://www.electro-tech-online.com/electronic-projects-design-ideas-reviews/100276-prolong-halogen-lamp-life-burns-240v-ac.html Fri, 20 Nov 2009 16:12:55 GMT Prolong halogen lamp life (burns from 240V AC) Hi, I have problem with halogen lamps, they are rated for 230V AC. However I have 240V AC at... Prolong halogen lamp life (burns from 240V AC)


Hi, I have problem with halogen lamps, they are rated for 230V AC.

However I have 240V AC at day time and at nights 245V AC.

I was thinking to use 100Ohm 5W resistor for 40W lamp
and 33Ohm 10W for 100W lamp. The only disadvantage is that the power is wasted (used to heat the room :( ).

Is there any other way besides using resistor to make correct 220V instead of 240V AC? ]]> Electronic Projects Design/Ideas/Reviews smilem http://www.electro-tech-online.com/electronic-projects-design-ideas-reviews/100276-prolong-halogen-lamp-life-burns-240v-ac.html Rate of flow of water http://www.electro-tech-online.com/electronic-projects-design-ideas-reviews/100272-rate-flow-water.html Fri, 20 Nov 2009 15:14:40 GMT I want to construct a device that can determine the rate at which water flows in a river at time interval. I need a circuit diagram for these device. I want to construct a device that can determine the rate at which water flows in a river at time interval. I need a circuit diagram for these device. ]]> Electronic Projects Design/Ideas/Reviews Malvinelly http://www.electro-tech-online.com/electronic-projects-design-ideas-reviews/100272-rate-flow-water.html Dissertation Help http://www.electro-tech-online.com/electronic-projects-design-ideas-reviews/100270-dissertation-help.html Fri, 20 Nov 2009 13:35:25 GMT I am a 3rd year Mechatronics Engineer and for my dissertation I am doing a project on dog care. I was thinking of designing an electronic kennel that... I am a 3rd year Mechatronics Engineer and for my dissertation I am doing a project on dog care. I was thinking of designing an electronic kennel that would look after the dog for a day or 2 without the owner being present. I was going to incorporate a temperature controlled heater, timer released food, internet web camera and a door that would only let the dog you want inside. Any ideas of what kind of coding and equipment this would involve would be a big help? Also if there is any other suggestions on what should be incorporated in this project I would be very grateful.
Dan Gennard ]]> Electronic Projects Design/Ideas/Reviews dan.gennard http://www.electro-tech-online.com/electronic-projects-design-ideas-reviews/100270-dissertation-help.html is it possible to do the project described below! http://www.electro-tech-online.com/electronic-projects-design-ideas-reviews/100269-possible-do-project-described-below.html Fri, 20 Nov 2009 13:23:40 GMT i have an idea to do the project relevant to medical electronics. main idea is getting information about blood cells such as amount of red and... i have an idea to do the project relevant to medical electronics.

main idea is getting information about blood cells such as amount of red and white cells , blood group, vitamin deficiency etc.

but i don't know the method how to get cell counts by some drops of blood sample.

any suggestions and ideas regarding the project?



thanks for informations.... ]]> Electronic Projects Design/Ideas/Reviews mic5 http://www.electro-tech-online.com/electronic-projects-design-ideas-reviews/100269-possible-do-project-described-below.html variable capacitor http://www.electro-tech-online.com/electronic-projects-design-ideas-reviews/100264-variable-capacitor.html Fri, 20 Nov 2009 10:09:22 GMT can l use a tuning capacitor on the radio receiver as a variable capacitor on my FM transmitter. wat is the range of the capacitor that is tha max... can l use a tuning capacitor on the radio receiver as a variable capacitor on my FM transmitter. wat is the range of the capacitor that is tha max and min capacitance ]]> Electronic Projects Design/Ideas/Reviews chikedef http://www.electro-tech-online.com/electronic-projects-design-ideas-reviews/100264-variable-capacitor.html Studio Ring Flash Xenon Tubes http://www.electro-tech-online.com/electronic-projects-design-ideas-reviews/100263-studio-ring-flash-xenon-tubes.html Fri, 20 Nov 2009 09:32:41 GMT Hi, I am an IT engineer and electronics is not really my strong point.
I am making a studio ring flash for the wife's studio as new ones just cost way way to much.

I have ripped apart 6 Olympus T20 flash units and salvaged the triggers, Photo-Flash capacitors and Xenon tubes from them.

I want all six to fire with the one trigger and one charging circuit.

I have drawn up the below circuit made from various information I have found on this site but like I said before my electronics understanding is limited so was hoping someone that does know something could look over the circuit and tell me if there is anything odvious wrong with it before I build it.

Here are the specs of the parts I have

-> Capacitors I have for C1,C2,C3,C4,C5,C6 are all the same and have wrote on them Photo-Flash 330v 450uF Auto-Cap FLX

-> The 6 triggers have the following specs
Trigger Coil (Trigger Transformer) for Xenon Tubes Secondary Voltage (Max unloaded) 11 kV
Primary VOltage (Max unloaded) 300 V
Trigger Energy (Max) 10 mWs
Trigger Power (Max) 0.5 W
Transformer Ratio 1:36
Primary Inductance 20 uH
Trigger Capacitor 0.047 - 0.22 uF

-> For R1 the power resistor I have purchased 1 x 47R 100W Aluminium clad wirewound resistor, Resistance tolerance 5%

-> The flash tubes are all 28ws CB254200Xe Lamps

-> Rectifier Diodes are all 1N4004 1AMP 400V (not to sure about these, are the amps enough?)

-> SCR S6403K 6 AMP 400 VOLTS

-> MOC3020M Integrated Circuit x 1 K3020

Can someone please look at this circuit for me and the components I have and tell me if it will work.

Thank you very much in advance.



Thank you

Jamie ]]> Electronic Projects Design/Ideas/Reviews Jamie Pocock http://www.electro-tech-online.com/electronic-projects-design-ideas-reviews/100263-studio-ring-flash-xenon-tubes.html Controlling over 1000 rgb leds http://www.electro-tech-online.com/electronic-projects-design-ideas-reviews/100261-controlling-over-1000-rgb-leds.html Fri, 20 Nov 2009 08:04:42 GMT Hi i am about to under go a huge project consisting of just over 1000 RGB led's.

My goal is to create a wall of RGB leds, each color individually controlled with PWM (fading), i would like the wall to be divided up into smaller circuits in which a small number of leds will be controlled from, each smaller circuit will talk to each other via serial and all will be controlled by a PC, Arduino or DMX. I will be controlling each circuit from a Ardiuno mega.

TLC5940 - Made a circuit with 3 of these per board to control 16 RGB leds.

This was my first choice being very easy to use. But i did run into some faults, first was it is a sink driver so finding leds to suit was hard being in Australia. i tried using transistors, and they worked fine for a while but one would drop out every so often plus it took so long to solder up 48 transistors per board. The second was each one is daisy chained in a way that if one of the chips die halfway all from that point will stop working.

MAX7313 - Used 3 per board to control 16 rgb leds

i found with this chip i was unable to use high power leds, everytime i tried i blew the chip. one thing i like was the 2 wire serial unlike the TLC5940 which uses 5. i liked how each one was addresable makeing it very easy to code for.

PIC16F628 - I have not yet tried this chip

this was my latest idea, I'm not sure if it will work well in the large form but it will make the coding a lot simpler by having set code on each chip then control it all by the Arduino or PC. The chip can handle super bright leds and has plenty of information out there on them.

If anyone has any ideas to what method i should choose, or if someone has a completely new idea it would be much help. ]]> Electronic Projects Design/Ideas/Reviews hicksynet http://www.electro-tech-online.com/electronic-projects-design-ideas-reviews/100261-controlling-over-1000-rgb-leds.html doorbell with counter ic http://www.electro-tech-online.com/electronic-projects-design-ideas-reviews/100257-doorbell-counter-ic.html Fri, 20 Nov 2009 06:53:20 GMT I have come up with the project counting the number of visitors.But my circuit doesnt count untill i disenable the display device(7 segment common... I have come up with the project counting the number of visitors.But my circuit doesnt count untill i disenable the display device(7 segment common cathode)or it counts reaching 5 it doesnot move to 6.what can be the possible problem.AM using cmos IC 4026. ]]> Electronic Projects Design/Ideas/Reviews BWIRE OJIAMBO http://www.electro-tech-online.com/electronic-projects-design-ideas-reviews/100257-doorbell-counter-ic.html Dragons Breath http://www.electro-tech-online.com/electronic-projects-design-ideas-reviews/100255-dragons-breath.html Fri, 20 Nov 2009 01:48:02 GMT I have 11 LED's that I want to light in sequence, all turn off, & repeat for as long as the 12v. supply is on. Sort-of a "3d brake light" on a vehicle. These LED's will be encased into a fiberglas tire cover w/ a dragon on it. The "Dragon's fire" will be in casting resin (transparent f-glas). I need the control (clock). Am familiar w/ LED's somewhat used for interior lighting, etc. and the required resistors. Assistance needed/welcome. TKX bunches.:) ]]> Electronic Projects Design/Ideas/Reviews tinkerunique http://www.electro-tech-online.com/electronic-projects-design-ideas-reviews/100255-dragons-breath.html 12V to -5V/0/5V http://www.electro-tech-online.com/electronic-projects-design-ideas-reviews/100252-12v-5v-0-5v.html Fri, 20 Nov 2009 00:18:49 GMT Hi all,

I'm working on a MIDI synth project and have questions regarding its power supply. I want to power it from one of those 12V DC/350mA bricks I have around. I need to generate roughly +5V, 150 mA (for a microcontroller, a backlit LCD display and a bunch of LEDs / logic circuits, and the audio circuitry), 50 mA for the -5V rail (audio circuitry only). What I use so far is a resistor divider and an ersatz of high-current op-amp using an op-amp for the feedback + a push-pull: http://img19.imageshack.us/img19/8468/picture3ge.png . I am bit worried that this might not be the best option, because one of the transistors tends to generate a lot of heat. And this takes a lot of PCB real estate.

I have found many virtual grounds circuits online, but most of them seem to be for headphone amps where the load on the -/+ rails is equal -- so I am not sure if they would perform well with an uneven load. I'm tempted to try the TLE2426 + BUF634 + anonymous op-amp for the feedback loop, but this is a more expensive solution...

Any other approach to this problem? ]]> Electronic Projects Design/Ideas/Reviews jamboard http://www.electro-tech-online.com/electronic-projects-design-ideas-reviews/100252-12v-5v-0-5v.html Looking for stepper motor control and an output. http://www.electro-tech-online.com/electronic-projects-design-ideas-reviews/100251-looking-stepper-motor-control-output.html Thu, 19 Nov 2009 23:44:35 GMT I have this job of taking pictures of a single frame on film. So looking at using a stepper motor to advance the film one frame which should be a... I have this job of taking pictures of a single frame on film. So looking at using a stepper motor to advance the film one frame which should be a specific distance on each frame and constant. Then once the stepper motor stops trigger an output to make a switch that takes the picture. Then advance to next frame but may need to pause for a short period till image has been buffered out. trigger the output to take picture and advance to next frame. The picture software can be controlled off a USB foot pedal switch that I say is a simple device. Never cracked it open but guessing here on that it is a switch on the foot pedal.

Not looking at anything from scratch but a premade board with simply software to control a stepper motor and and output will be just fine. The picture software is always ready till foot pedal is pressed.

Thank you for your time and help.
Brian ]]> Electronic Projects Design/Ideas/Reviews Brian1 http://www.electro-tech-online.com/electronic-projects-design-ideas-reviews/100251-looking-stepper-motor-control-output.html Time Delay Relay http://www.electro-tech-online.com/electronic-projects-design-ideas-reviews/100250-time-delay-relay.html Thu, 19 Nov 2009 23:21:17 GMT I am trying to fill water to a hot tub. I have this switch mounted at the desired level. liquid float switch water level sensor(stainless steel) -... I am trying to fill water to a hot tub. I have this switch mounted at the desired level.

liquid float switch water level sensor(stainless steel) - eBay (item 130344525090 end time Nov-21-09 06:01:44 PST)

An intermatic D17 timer turns on every two hours for 7 minutes, supplys power to a 24vac transformer to switch and solenoid valve.

When the water is about to fill the switch bounces due to waves and thus shutting on off the valve every 4-5 seconds and has "hammering effect".

What kind of relay can I use to turn off the valve only when the switch is off for atleast 30 or more seconds.
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]]> Electronic Projects Design/Ideas/Reviews luxuryinn http://www.electro-tech-online.com/electronic-projects-design-ideas-reviews/100250-time-delay-relay.html 4P2T selector switch diagram http://www.electro-tech-online.com/electronic-projects-design-ideas-reviews/100245-4p2t-selector-switch-diagram.html Thu, 19 Nov 2009 21:50:10 GMT Hi folks. Today I was asked to come up with a method of switching between a calibration mode and an operation mode for a test apparatus. The... Hi folks.

Today I was asked to come up with a method of switching between a calibration mode and an operation mode for a test apparatus.

The current situation is that the operations technician, who must periodically certify the temperature calibration with a 100 Ω standard probe simulator (decade box), also must remove the cover of the apparatus and remove the main circuit board to access the sensor connections for his procedure.

Our company policy is that any procedure that requires gaining access to circuits with potentially hazardous voltages (ie cover removal) must be performed by qualified personnel. This would be myself, an Instrumentation technician, or an Electrician. However, calibration procedures (such as this) are typically handled by operations personnel, but this is a rare instance where external provisions for calibration are not made (design flaw).

The equipment in question has two identical circuits with two seperate temperature sensors. The sensors are the components that are certified by resistance simulation. The decade box is connected in place of the sensor and variable resistances (i.e. known reference temperatures) are presented to the control circuits. The apparatus is deemed serviceable if the control circuits agree with the decade box. Another procedure involves a calibrated hot/cold source with the sensor submerged, but that is not material here.

At any rate. I have drawn up a schematic for two 4P2T switches and connectors to be mounted on the enclosure and wired for external calibration. This will eliminate the need to remove the cover.

In my mind, this is the easiest approach, but it would be nice to have a single switch and a single connector. The only problem in my mind is the spaghetti factory that the wiring would require. I'm not even sure what kind of switch would work. 8P2T?

I was hoping forum members might give me a critique, note any difficiencies in my drawing, and suggest improvements. This will be submitted to electrical engineers at the apparatus factory as well as my management for review.

Thanks for the help in advance.
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]]> Electronic Projects Design/Ideas/Reviews ke5frf http://www.electro-tech-online.com/electronic-projects-design-ideas-reviews/100245-4p2t-selector-switch-diagram.html Relay Rating Question http://www.electro-tech-online.com/electronic-projects-design-ideas-reviews/100244-relay-rating-question.html Thu, 19 Nov 2009 20:06:12 GMT Hi all

This may sound like a stupid question, probably is, but I'm a little cunfused:confused:

A relay is rated:
Quote:
Contact rating (resistive) = 16A 250VAC / 30VDC
(inductive)= 8A 250VAC / 30VDC

Max Switching Voltage = 250VAC / 30VDC

Max Switching current = 16A

Max Switch Power = 4000VA / 480W
So what I'm confused about is, if its rated for 16A 250VAC, that equates to 16x250 = 4000W, they refer to it as 4000VA / 480W? Isn't 480W @ 250V = 1.92A?

I need a relay to which a 800W 220V inductive load (metal Halide Light), so this won't work?
Attached Files
File Type: pdf HRM2_A.pdf (158.1 KB)
]]> Electronic Projects Design/Ideas/Reviews Lighty http://www.electro-tech-online.com/electronic-projects-design-ideas-reviews/100244-relay-rating-question.html