Hello, I've discovered logic-level mosfets, and am using an Arduino to drive a small 12VDC (about an amp or so) pump motor with PWM, using an...

Hello, I've discovered logic-level mosfets, and am using an Arduino to drive a small 12VDC (about an amp or so) pump motor with PWM, using an IRLZ34N as the power mosfet. Would a mosfet-driver be recommended to switch that mosfet on and off more quickly? Or is a logic-level mosfet already designed to efficiently turn on and off with the weak logic level signal? Thanks, Michael

I was wondering about using a Variable Speed AC Drive for two air conditioners. One is a window unit, with rotary compressor that uses single...

I was wondering about using a Variable Speed AC Drive for two air conditioners. One is a window unit, with rotary compressor that uses single phase with a capacitor to phase shift and three wires to the motor. Can this be made to run as a three phase motor without the cap? As far as I'm aware "inverter" (hvac-speak for VFD drive) aren't available for window units, in spite of their highe...

I recently bought a gas water heater and made a point of getting one that didn't require external electrical power to operate. To my...

I recently bought a gas water heater and made a point of getting one that didn't require external electrical power to operate. To my astonishment, it nonetheless came with what behaves like a digital controller, complete with a green LED status light that must require close to 3 volts to turn on. The electronics are operated from a standard Honeywell thermopile generator producing 750 ...

This may be a stupid question, but here goes. We all know that cable is graded for its current carrying capabilities according to its...

This may be a stupid question, but here goes. We all know that cable is graded for its current carrying capabilities according to its cross-sectional area. BUT, could one conceivably pass excessive amounts of current through a cable not rated to carry it by pulsing the current in short bursts at a very low duty cycle?

I recently built the JYE Tech DSO-150 Shell oscilloscope kit (#15001K) that I got from Banggood for $24 plus a power supply. These are...

I recently built the JYE Tech DSO-150 Shell oscilloscope kit (#15001K) that I got from Banggood for $24 plus a power supply. These are single-channel, low-frequency scopes, but would be useful for things one might do with an Arduino or similar microcontroller, such as stepper motors and servos, plus of course general audio stuff. The bandwidth spec is 200 kHz, but I suspect the display...

So I bought a reel each of BF862-235 and BF862-215. Other parts seem to have the same suffixes, but a quick web search comes up with...

So I bought a reel each of BF862-235 and BF862-215. Other parts seem to have the same suffixes, but a quick web search comes up with nothing useful, and the datasheet links for the two types of parts go straight to the same place. I'd guess this has something to do with ROHS/halogen free/greenie-knotted-knickers-of-the-month, but don't know for sure. Wisdom? Thanks Phil Hobbs ...

If you don't want ethernet cable strung all over the house can't you just get a repeater router and plug the ethernet line into that? No one...

If you don't want ethernet cable strung all over the house can't you just get a repeater router and plug the ethernet line into that? No one wants to commit and admit this works. Bret Cahill

Looking at getting Spectrum cable but having spec difficulty. They will provide a router only, router with wifi or router with wifi and phone...

Looking at getting Spectrum cable but having spec difficulty. They will provide a router only, router with wifi or router with wifi and phone but cannot give me specs. What's my problem ? I currently have AT&T WiFi Router that does not have much power out and seems to drop WiFI or internet or ??? often. My security cams turn off and the app shuts down. Bad app too ! If I use WiFi...

Does someone knows how to prevent LS1203 scanner to enter in "sleep mode " ?. I have set auto scan mode to scan continuously, but after some...

Does someone knows how to prevent LS1203 scanner to enter in "sleep mode " ?. I have set auto scan mode to scan continuously, but after some time of inactivity, scanner will enter sleep mode. The problem is that this should be fully automated and closed system, so user will have no access to scanner. We have used this scanner before and it has worked for few months without entering sl...

It seems to me that flyback SMPSes use pulsed DC instead of AC. Is this true? For example, here, the transistor simply turns on and off,...

It seems to me that flyback SMPSes use pulsed DC instead of AC. Is this true? For example, here, the transistor simply turns on and off, providing pulses to the transformer, right? http://www.repairfaq.org/sam/smpsbd.gif Would SMPSes be more efficient if their transformers were fed high-frequency AC instead of high-frequency pulsed DC (for example, by using an H-bridge to provide a neg...