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Power Amplifier for 100kHz.

Started by Clive Arthur in sci.electronics.design6 months ago 80 replies

I'm not an analog design expert, but needs must. I recently adapted a Doug Self audio amplifier design for use on a 60V single supply, and to...

I'm not an analog design expert, but needs must. I recently adapted a Doug Self audio amplifier design for use on a 60V single supply, and to go up to 100kHz with a working ambient temperature of -20'C to 180'C. I can't show the circuit, but it was based on Fig 1a here... http://www.douglas-self.com/ampins/dipa/dipa.htm Cdom needs to come down for this higher frequency application, b...


Yet another Class AB autobias

Started by piglet in sci.electronics.design6 months ago 32 replies

Inspired by the late Jim Thompson's autobias design that we saw in the thread "Power Amplifier for 100kHz" I thought his use of a bang-bang...

Inspired by the late Jim Thompson's autobias design that we saw in the thread "Power Amplifier for 100kHz" I thought his use of a bang-bang comparator in setting bias was non-optimal but I liked his idea of running the pa in pure class B for large signals and setting a minimum quiescent class A current for small signals. My idea uses JT's way of sensing output device current falling bel...


OT: (consumer) propane tanks

Started by Don Y in sci.electronics.design6 months ago 47 replies

I was at the hardware store, today. A guy walked in with a propane tank from a BBQ grill. The staff went ballistic! "You have to take that...

I was at the hardware store, today. A guy walked in with a propane tank from a BBQ grill. The staff went ballistic! "You have to take that around the back!" "I already did. No one answered the door." "You can't carry it through the store. It's *illegal*..." which, immediately got me wondering if that's a truth or just an exaggerated belief (illegal == not tolerated by store ...


Digikey vs. Mouser, or is it AKA?

Started by David Lesher in sci.electronics.design6 months ago 4 replies

Flipping back and forth between their websites, I get the opinion that they are faces of the same outfit. Any truth to that? -- A host is...

Flipping back and forth between their websites, I get the opinion that they are faces of the same outfit. Any truth to that? -- A host is a host from coast to coast...............wb8foz@panix.com & no one will talk to a host that's close.......................... Unless the host (that isn't close).........................pob 1433 is busy, hung or dead.......................................


SSR tempco

Started by John Larkin in sci.electronics.design6 months ago 3 replies

I might use an LED+mosfet type SSR to switch a voltage divider at the input of an isolated ADC. The ON resistance of the switch is an error...

I might use an LED+mosfet type SSR to switch a voltage divider at the input of an isolated ADC. The ON resistance of the switch is an error contributor, and a super-low Ron is expensive. 1 or 2 ohms is affordable. I'm thinking that driving the LED side from the proper Thevenin source might temperature compensate the ON resistance of the mosfets. Or even program the LED supply with a DAC....


That time of year

Started by john larkin in sci.electronics.design6 months ago 7 replies

The pcb houses and metal fab shops are sending us big boxes of chocolates. Why don't Digikey and Arrow do that?

The pcb houses and metal fab shops are sending us big boxes of chocolates. Why don't Digikey and Arrow do that?


LT spice strangeness

Started by John Larkin in sci.electronics.design6 months ago 1 reply

If I set up a BV with equation V=int(TIME) I expect a clean step of one volt every second. That's not what happens. Steps are slopey...

If I set up a BV with equation V=int(TIME) I expect a clean step of one volt every second. That's not what happens. Steps are slopey and strange. I have to declare a max time step of about 100 us to clean it up, which is a nuisance since I'm running for 500 seconds. Actually, I'm not simulating a circuit, just using some BV's to plot some equations. But still.


capometer

Started by john larkin in sci.electronics.design6 months ago 2 replies

Has anyone used the LT Spice capometer part?

Has anyone used the LT Spice capometer part?


Cute HV breakdown tester

Started by piglet in sci.electronics.design6 months ago 3 replies

The price was irrestistible and I had low expectations about build quality but this pocket sized HV breakdown tester is proving surprisingly...

The price was irrestistible and I had low expectations about build quality but this pocket sized HV breakdown tester is proving surprisingly useful... Anyone else using them? piglet


cheap usb ("thumb") drives

Started by Don Y in sci.electronics.design6 months ago 62 replies

I've got a box that builds a "backup partition" on a machine and then invokes it to install the OS/apps prior to distribution. Some of the...

I've got a box that builds a "backup partition" on a machine and then invokes it to install the OS/apps prior to distribution. Some of the clients are hosing the backup partition by trying to upgrade to Windows, etc. I'd like, instead, to offer a thumb drive as installation media in lieu of the backup partition. - Can I make a thumb drive "read only" prior to distribution? (so the ...


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