Raju Baddi's profile
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- Simple capacitance meter bins parts
- This slide-show gives a home made spdt switch : http://youtu.be/nbFsB9VGQt4
- Use a heated diode as a flow sensor
- Regarding the quality of a DI I have something to share. I think there could be four parameters, New : Is the idea valuable for human knowledge database ? Have not come across this idea before ? (1/0) Useful : Would you like to use it for any purpose(at all) or do you think it would be useful for any purpose in the future ? (1/0) Popularity/Fun: Was this informative, did you enjoy reading the article. Did it hold your attention ?(1/0) Efficiency: Does it implement something common in a new way or a simpler way or a better way etc. (1/0) In short NUPE factor, goes from 0 to 4.
- 1st successful test of the transistor, December 16, 1947
- A few lines I wrote for the transistor on its birthday: Mankind with vacuum tubes was buried under the tyranny of colossal power consumption. For their creation, maintenance and destruction had put upon him severe technological limitation. Vacuum tubes with hot heater of high wattage wouldn't work without high voltage. Compel d man looked for new device that would bring limitation to its demise. So came into being the transistor destined to be the vacuum tube Vanquisher. Your immediate power consumption was insignificant and the amplification you produced was sufficient. Running cool and wise unlike the tube didn't have the scorching sun inside. Your operation was simple, age longer, size smaller and the dominion ever larger. Number of terminals you have are three each one imitates a celestial deity. For under your guidance the charge carriers in emitter base collector have duties. That can be likened to with those of the Brahma Vishnu Maheshwara deities. How shall your size, power and efficiency in the contemporary times I hail. For you can project the multi storied power monster ENIAC on thumb nail. Thank your size so small there is today computer in pockets of all. Ever ready you for any fight is there a rival technology in sight? With vacuum tube behind I guess you are the dearest device of mankind. Blowing life into all his complex machinery you take him towards progressive certainty. So important was your invention you have given humans a chance against extinction. Millions of you on a chip monolithic crunch his computation without a hick. Important device that you are alone setting for all intelligent life a milestone. Happy birthday on this 21st line with glory in the future you shine. Lastly its around you thinking that makes the $150 EDN cheque keep coming.
- Simple diode serves as a sensor for a thermal probe
- A video can be seen at : http://youtu.be/FJmlqWgDNnQ
- Use LEDs as photodiodes
- Another video can be seen which uses the above set up at : http://youtu.be/a7ZZrGIMlig
- Detect charged bodies with electronic electroscope
- The gain of the transistor(when one has to use an available transistor only) can be decreased(disappointing) by passing a reverse break down current through the base-emitter junction. Perhaps this can be done in a controlled manner(by short pulses of current) to reduce the gain to a desired level? Side effects ?!
- AC-power your circuit without a transformer
- Regarding safety one more possibility that has occured to me which I would like to share is the use of tube light starter(one will have to check if one considered non-functional with regard to the tube light would still do for our purpose). This may help to burn the fuse when the capacitor shorts out ? Another precaution would be to include an inductor after the bridge in the d.c part ? to allow the voltage growth ? By the way I have shifted the video here: http://youtu.be/j69sbErW-sc .
- Auto pulse generator senses and responds to a probed load
- Probably this circuit is valuable for a spot welder. Had something in the back of mind for it I just recalled. I think this idea came to me when I was considering making a spot welder using transistors for tiny metal joints.
- Logic gates form high-impedance voltmeter
- It is recommended to vary the supply voltage from maximum towards lower values. This is because when the test voltage is larger than the supply the gates input may break down and begin conducting and we will not be having the high impedance. However as the supply voltage exceeds the test voltage this would stop. This intermediate break down may not be desired in certain case.
- Pocket white-LED torch is power efficient
- Tips for the circuit : Efficiency depends on how power is wasted in the astable, transistor switch Q3 and the inductor. Power in the astable is mainly wasted in the collector resistors of Q1 and Q2. In our case 1.2^/510 ~ 3mW. Low value of collector resistors yields better waveform. To minimize power loss in the astable optimize(increase) for the collector resistor values. Here : http://arxiv.org/abs/1201.1819 , another version of the astable is given which produces better waveform at higher values of collector resistors. One can try it with germanium transistors/diodes. Power loss can also occur in the base resistor of Q3 and due to voltage drop across its CE terminals as it carries heavy current. One should also minimize the inductor coil resistance for example at 50mA current and 2 Ohm resistance the power loss is 5mW. I would like to mention here that the germanium version below works down to 0.12V and has an efficiency of ~50% at voltages as low as ~0.24V(3XAC126, 2X100nF, 680/470, 1k for Q3 base, 22mH/22mH ferrite-core transformer).
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