Halbach Arrays

Started by Anonymous in sci.electronics.design1 week ago 27 replies

I read that one of the innovations in the PM motors Tesla is using in the model 3 is the Halbach array they use for the magnets. Seems this...

I read that one of the innovations in the PM motors Tesla is using in the model 3 is the Halbach array they use for the magnets. Seems this greatly increases the magnetic field on one side of the magnets for little downside. The trick is being able to glue powerful magnets in an arrangement where they strongly repel one another. The guy talking about them said when they first saw


Troubleshoot desk lamp

Started by amdx in sci.electronics.design1 week ago 3 replies

After the hurricane and power outage I had a defective radio, computer and desk lamp, all plugged into the same outlet. Nothing else electrical...

After the hurricane and power outage I had a defective radio, computer and desk lamp, all plugged into the same outlet. Nothing else electrical in the house was damaged. The lamp is fluorescent FML-27W-6500k it has 4 pins. > https://www.amazon.com/Four-Tube-6500K-4-Pin-Light/dp/B0074RGI The fixture has an electronic ballast. The ballast looks clean, nothing odd except a unidentified


Circuit for Randomized Pulse Width Modulation

Started by Robert Martin in sci.electronics.design1 week ago 43 replies

I have a CD4060 outputting a 5Vpp 4Hz (4 hertz) square wave at 50% duty cycle. How can I randomly pulse width modulate this so that when a...

I have a CD4060 outputting a 5Vpp 4Hz (4 hertz) square wave at 50% duty cycle. How can I randomly pulse width modulate this so that when a low pass filter is added a constantly changing, "wave-like" arbitrary waveform will be produced? I would prefer analog or CMOS IC's, not a microprocessor, and minimum parts count. The "randomness" does not need to be true but only a reasonable ...


Dog likes going to vet - 26 seconds

Started by John S in sci.electronics.design1 week ago 3 replies

https://www.youtube.com/watch?v=Uk8Vn2OWxiE

https://www.youtube.com/watch?v=Uk8Vn2OWxiE


Order top gradeAAA+ marijuana strains at https://marijuanasalesshop.com/ +1 (510) 775 2407 / Wickr ID: marijuana442

Started by kelly in sci.electronics.design2 weeks ago

Order top gradeAAA+ marijuana strains at https://marijuanasalesshop.com/ +1 (510) 775 2407 / Wickr ID: marijuana442

Order top gradeAAA+ marijuana strains at https://marijuanasalesshop.com/ +1 (510) 775 2407 / Wickr ID: marijuana442


Security Problem

Started by Anonymous in sci.electronics.design2 weeks ago 9 replies

Recently, I got an email from Google saying someone had tried to log onto my Google account using my password. They said they blocked it but I...

Recently, I got an email from Google saying someone had tried to log onto my Google account using my password. They said they blocked it but I should check out the problem. I'm using a dial-up connection and recently the modem has been downloading about 2 gigabytes of data and runs all the time. I tried to shut the machine off and I got a message that the AVG virus program was b


Connect 120 volt circuits to get 240 volts

Started by Anonymous in sci.electronics.design2 weeks ago 220 replies

For faster charging when not at a public charger a portable way to get 240 volts at a home or business that doesn't have 240 volt outlets is to...

For faster charging when not at a public charger a portable way to get 240 volts at a home or business that doesn't have 240 volt outlets is to pick off two outlets that are wired to separate circuits on opposite sides of the 240 volt power. There is a commercial product for this and designs on the web. I found this schematic. https://cdn.hackaday.io/images/2004701426644738630.


DC background subtraction

Started by George Herold in sci.electronics.design2 weeks ago 47 replies

Perhaps a silly simple question. I need to subtract off a 2.5V background from a few mV signal. I first think about a difference amp, or...

Perhaps a silly simple question. I need to subtract off a 2.5V background from a few mV signal. I first think about a difference amp, or instrument amp. But I wondered if there is any advantage to a simple opamp summing amp. (I'll add in -2.5 V) George H.


unlicensed max xmit powet at 8Ghz?

Started by sdy in sci.electronics.design2 weeks ago 10 replies

What is FCC limit on unlicensed ERP at 8.3 Ghz and 7.2Ghz? Doing some testing into patch antennas and don't want a visit from FCC. or maybe I'll...

What is FCC limit on unlicensed ERP at 8.3 Ghz and 7.2Ghz? Doing some testing into patch antennas and don't want a visit from FCC. or maybe I'll just stick the patch into a piece of RF foam adsorber in a cup.


H-Bridge with level shift - MOSFET gate voltage issues?

Started by Tim Watts in sci.electronics.design2 weeks ago 64 replies

Hi, Not much good with analogue, would be grateful for any comments on this please...

Hi, Not much good with analogue, would be grateful for any comments on this please :) https://www.circuitlab.com/circuit/a5399q386x6h/test-h-bridge/ (or simple picture) https://ibb.co/vh7GRG2 That's half an H-Bridge, we'll have 2 in full H-Bridge configuration driving a 30V LED garden light string from a Raspberry Pi (details below). R2/R3 are dummy loads for simulation, please i...


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