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Search found 1746 matches
- Tue Dec 13, 2022 12:56 am
- Forum: General Discussion
- Topic: Looking for long range HF RFID antenna
- Replies: 7
- Views: 41858
- Sun Dec 11, 2022 8:45 pm
- Forum: General Discussion
- Topic: Looking for long range HF RFID antenna
- Replies: 7
- Views: 41858
Re: Looking for long range HF RFID antenna
What do you consider "long range"?
- Wed Dec 07, 2022 10:23 pm
- Forum: General Discussion
- Topic: LM3914 Help
- Replies: 14
- Views: 43027
Re: LM3914 Help
I hope I did it right and am done.If you need a calculator for the LM3914, there's plenty on-line.
For example, LT1084 sheet says 10 mA minimum load and Out to Ref is 1.5V. A few clicks on Windows calculator I had resistor values.
((R1 may need to be 9.31 kΩ instead of 14.7 kΩ.))
Cheers,
- Wed Dec 07, 2022 8:49 pm
- Forum: General Discussion
- Topic: LM3914 Help
- Replies: 14
- Views: 43027
Re: LM3914 Help
LT1084 spec sheet https://www.mouser.com/datasheet/2/609/ ... 269789.pdf
Could somebody double check my numbers please.
dacflyer, should keep you busy for a bit.
Cheers,
Could somebody double check my numbers please.
dacflyer, should keep you busy for a bit.
Cheers,
- Tue Dec 06, 2022 6:23 am
- Forum: General Discussion
- Topic: LM3914 Help
- Replies: 14
- Views: 43027
Re: LM3914 Help
Unless you want the fun
- Tue Dec 06, 2022 5:20 am
- Forum: General Discussion
- Topic: LM3914 Help
- Replies: 14
- Views: 43027
Re: LM3914 Help
Short time I would have suggested two 9V batteries in series through a momentary contact switch to pin 3 of LM3914.
Full time calls for a voltage regulator from BUT (battery under test). I'll modify image from post 1 and come back.
Cheers,
- Sun Dec 04, 2022 12:24 am
- Forum: General Discussion
- Topic: LM3914 Help
- Replies: 14
- Views: 43027
Re: LM3914 Help
Will this stay connected to battery full time and continuously on? Or with a momentary "on" switch?
- Sat Dec 03, 2022 10:02 pm
- Forum: General Discussion
- Topic: LM3914 Help
- Replies: 14
- Views: 43027
Re: LM3914 Help
Actual spec sheet
https://www.ti.com/lit/ds/symlink/lm3914.pdf
max supply is 25V and measure input(s) protected to 35V.
Regulate supply to 15V - 18V. Voltage divide input by 2. That will give a 26V high end input, while staying safely away from IC maximums.
(half of 26V is 13V)
Cheers,
https://www.ti.com/lit/ds/symlink/lm3914.pdf
max supply is 25V and measure input(s) protected to 35V.
Regulate supply to 15V - 18V. Voltage divide input by 2. That will give a 26V high end input, while staying safely away from IC maximums.
(half of 26V is 13V)
Cheers,
- Thu Nov 17, 2022 4:08 am
- Forum: General Discussion
- Topic: Spamming for Spammings sake?!
- Replies: 3
- Views: 19765
Re: How to Identify a Problematic Cylinder Head
If it is like Kuwait, the foreigners who are in-country to do the dirty jobs for more than they could get in their own country.who in Dubai would be buying a bottom tier GM vehicle anyway?
Cheers,
- Mon Nov 07, 2022 8:17 pm
- Forum: General Discussion
- Topic: loud tv commercials
- Replies: 5
- Views: 21258
Re: loud tv commercials
Sorry to rain on your parade, but progress probably prevents doing it. No more volume potentiometers, the circuit you need to tap into is inside a big chip, even the audio line(s) to the power amp chip could be a trace inside a multi-layer board. If you find something that works on modern TVs, let u...
- Thu Nov 03, 2022 8:24 am
- Forum: General Discussion
- Topic: Is Nuts and Volts dead ?
- Replies: 114
- Views: 3810230
Re: Is Nuts and Volts dead ?
Not really, just removed before you see it!At least most of the spam has come to a halt...
- Wed Nov 02, 2022 5:03 pm
- Forum: Computer Programming
- Topic: Excxel Question...
- Replies: 7
- Views: 39244
Re: Excxel Question...
How large is the file? Number of sheets in file?
- Tue Oct 04, 2022 5:43 am
- Forum: General Discussion
- Topic: Wall plug electrical pop noise from switch, motor, fridge, etc...
- Replies: 9
- Views: 58824
Re: Wall plug electrical pop noise from switch, motor, fridge, etc...
I think you mean varistor, AKA MOV (Metal Oxide Varistor).
A varactor is a diode whose capacitance is adjustable by applied DC. Used in radio receivers.
Cheers,
A varactor is a diode whose capacitance is adjustable by applied DC. Used in radio receivers.
Cheers,
- Tue Sep 06, 2022 5:23 pm
- Forum: General Discussion
- Topic: Wall plug electrical pop noise from switch, motor, fridge, etc...
- Replies: 9
- Views: 58824
Re: Wall plug electrical pop noise from switch, motor, fridge, etc...
What is the amplifier plugged into?
- Fri Sep 02, 2022 9:23 pm
- Forum: General Discussion
- Topic: Wall plug electrical pop noise from switch, motor, fridge, etc...
- Replies: 9
- Views: 58824
Re: Wall plug electrical pop noise from switch, motor, fridge, etc...
How can you tell if it's in the 120VAC wires or is it RF in the air? The noise is unlikely to come on AC lines and get through the amplifier's power supply. So RF through the air. BUT , the AC lines are a transmit antenna. The audio connecting cables (if any) and circuits in the amplifier are the r...