Efficient Actuators for Alpha Stirling

Started by Bret Cahill in sci.electronics.basics3 months 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...


Cheap display has weird frequency count

Started by m II in sci.electronics.basics3 months ago 2 replies

I bought an inexpensive volt/frequency led display from eBay. On a generator, I get the proper frequency display, around 60 Hz. When I tried it...

I bought an inexpensive volt/frequency led display from eBay. On a generator, I get the proper frequency display, around 60 Hz. When I tried it on a dc to ac inverter, square wave output, I get around 120 Hz. It's a two wire device, with power and signal coming off the same wire. What could I expect to see if a scope was connected to that inverter? The thing runs everything I've plugged int...


Display Systems |Pop Up Display| Exhibition Display Systems | Dot2Dot

Started by prabhat ooi in sci.electronics.basics3 months ago

We provide you widest ranges of Portable display systems, Exhibition display system, Popup backdrop display system, Banner Stand, Display system...

We provide you widest ranges of Portable display systems, Exhibition display system, Popup backdrop display system, Banner Stand, Display system accessories. Using ADVERTISING DISPLAY SYSTEM by DTD today and we can guarantee exhibitors are able to grab a great degree of attention even from a far distance. At DTD, we offer customized expo display products which can be used for any


The danger of battery-powered wearable frames with A.I. software

Started by Mr. Man-wai Chang in sci.electronics.basics3 months ago 2 replies

Robotic;Notes - Mizuka's death https://www.youtube.com/watch?v=rIoV60cIu7s

Robotic;Notes - Mizuka's death https://www.youtube.com/watch?v=rIoV60cIu7s


Impedance calculation (CS stage)

Started by Anonymous in sci.electronics.basics3 months ago 2 replies

Hello. I am trying to calculate the output impedance for the following circuit in SPICE notation (CS stage with drain-gate feedback): *...

Hello. I am trying to calculate the output impedance for the following circuit in SPICE notation (CS stage with drain-gate feedback): * input signal vin 1 0 * output signal (output port, where impedance should be calculated) vout 3 0 * resistors rs 1 2 rf 2 3 * nmos (drain, gate, source, bulk) mosfet1 3 2 0 0 Unfortunately, I am getting odd results in SPICE, probably becau...


Question on JFETs

Started by Chris in sci.electronics.basics4 months ago 31 replies

Hi all, I can't find much info on JFETs in my books which don't seem to go into much depth. They go into much detail, however, on biasing...

Hi all, I can't find much info on JFETs in my books which don't seem to go into much depth. They go into much detail, however, on biasing them in the *active* region. Why would anyone want to operate a JFET in the active region?? I can understand why it's useful to operate such a FET in the *ohmic* region where it can do something useful (like amplifying!) but AFAICS in the active re...


Timer Terminology

Started by ABLE1 in sci.electronics.basics4 months ago 21 replies

Hello All, I have been reading this newsgroup for some time, mostly for my own edification and mild amusement/wonderment. Thanks to all for...

Hello All, I have been reading this newsgroup for some time, mostly for my own edification and mild amusement/wonderment. Thanks to all for their on topic comments of the past few years. I now have a project that I am sure somebody in here can lend some insight. I am looking for a timer board and it would be helpful if I had the correct terminology so it would make my search easier....


Power output of TBA820M (audio amplifier chip)?

Started by Adam Funk in sci.electronics.basics4 months ago 8 replies

Does anyone know a formula for calculating the power output of the TBA820M audio amplifier IC? The data sheet gives the...

Does anyone know a formula for calculating the power output of the TBA820M audio amplifier IC? The data sheet gives the following examples: supply (V) load (?) output (W) 12 8 2 9 4 1.6 9 8 1.2 6 4 0.75 3.5 4 0.25 but the output isn't consistently proportional to V^2/R (which was my


Open the (mosfet) gate!

Started by Anonymous in sci.electronics.basics4 months ago 51 replies

I was looking at this datasheet: http://www.irf.com/product-info/datasheets/data/irlz34n.pdf Rds,on is 0.035 ohm with Vgs=10V (Id=16A) and...

I was looking at this datasheet: http://www.irf.com/product-info/datasheets/data/irlz34n.pdf Rds,on is 0.035 ohm with Vgs=10V (Id=16A) and it's advertised as such on the first page. But at Vgs=5V (Id=16A) the Rds,on is 0.046 ohm! I thought it was a logic level mosfet; I thought the gate would be FULLY OPEN at 5V... I guess I was wrong..? Michael


JFET mini-comparo--BFT862 not actually unique

Started by Phil Hobbs in sci.electronics.basics4 months ago 2 replies

I promised a bit of low-noise JFET comparison data. I looked at 4 BF862s from different reels, three ON Semi parts, the CPH3910, NSVM2394, and...

I promised a bit of low-noise JFET comparison data. I looked at 4 BF862s from different reels, three ON Semi parts, the CPH3910, NSVM2394, and NSVJ3557, and the Fairchild MMBFJ310. I swapped them in the same QL01 photoreceiver prototype, and found that all flavours of BF862 (from 4 reels) and two ON Semi parts, the CPH3910 and NSVJ2394 were indistinguishable (within a fraction of a dB out t...


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