Need help identifying and locating DIP-packaged trimpot resistor

Started by Anonymous in sci.electronics.basics5 days ago 11 replies

Aloha! I'm reverse engineering an early 1980s era PCB. On the board is this DIP-packaged trimpot resistor. Its dimensions is typical of a...

Aloha! I'm reverse engineering an early 1980s era PCB. On the board is this DIP-packaged trimpot resistor. Its dimensions is typical of a 14-pin 74-series package. The part consists of three 10K ohm trimpot resistors. From the schematic diagram (package is labeled MP1,) the three groups are: trimpot 1 - pins 2, 13, 14 trimpot 2 - pins 6, 9, 10 trimpot 3 - pins 4, 11, 12 https://ibb.c...


Might Be Stupid, But I Want Soe Opinions

Started by Anonymous in sci.electronics.basics1 week ago 45 replies

Got this camera, runs on two AA batteries. I want to eliminate them. I do not want USB, I want to have a three volt walwart, or one that is...

Got this camera, runs on two AA batteries. I want to eliminate them. I do not want USB, I want to have a three volt walwart, or one that is regulated down to three volts. I am not willing take the camera apart but I am willing to modify the cap for the batteries which is also the cap for the SD card it takes. I know I will probably have to eliminate the shorting bar which puts th


OT electronics nostalgia, NYC subway system

Started by default in sci.electronics.basics1 week ago 2 replies

http://nycsubway.org/wiki/Power_Generation Wonderful site of the history, design, construction etc. of the NYC subway system. Vintage pix of...

http://nycsubway.org/wiki/Power_Generation Wonderful site of the history, design, construction etc. of the NYC subway system. Vintage pix of the 75 RPM Steam piston plants that supplied 25 Hz 11 KVAC to the substations and rotary converters and motor-generators that supplied 600 VDC to the 'third rail.' During the summers my buddy and I would plunk down seven cents, and get on the 242 n...


Standing Waves

Started by Anonymous in sci.electronics.basics2 weeks ago

http://www.rbduncan.com/stdwave.htm

http://www.rbduncan.com/stdwave.htm


[FoxNews]A small town's sudden power surge fried tech gear in hundreds of homes

Started by Mr. Man-wai Chang in sci.electronics.basics2 weeks ago 31 replies

A small town's sudden power surge fried tech gear in hundreds of homes Full story:...

A small town's sudden power surge fried tech gear in hundreds of homes Full story: http://www.foxnews.com/tech/2017/01/31/small-town-sudden-power-surge-fried-tech-gear-in-hundreds -homes.html Residents in the small Pennsylvania town of Brookville must've wondered what on earth was going on earlier this month when a sudden power surge caused electrical appliances and gizmos in up to 1,


sequential transistor relay

Started by Anonymous in sci.electronics.basics2 weeks ago 1 reply

Good Day Sir/Ma'am, I'm a technician and I am in need of schematic diagram of a sequential four transistor driven relay which i will needing...

Good Day Sir/Ma'am, I'm a technician and I am in need of schematic diagram of a sequential four transistor driven relay which i will needing for my project as part of my study. I have a single input source driven by LDR, the first relay should be turned on and then off,while the second, third and fourth relay should be remain off, then when the LDR is active the second relay sho


Cables and Currents

Started by Chris in sci.electronics.basics3 weeks ago 23 replies

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?


Completing Quantum Theory

Started by Anonymous in sci.electronics.basics3 weeks ago 1 reply

http://www.amperefitz.com/complete.htm

http://www.amperefitz.com/complete.htm


California too incompetent to generate electricity from the sun.

Started by Robert H. in sci.electronics.basics4 weeks ago 5 replies

The World?s Largest Solar Plant Just Torched Itself Misaligned mirrors are being blamed for a fire that broke out yesterday at the world?s...

The World?s Largest Solar Plant Just Torched Itself Misaligned mirrors are being blamed for a fire that broke out yesterday at the world?s largest solar power plant, leaving the high-tech facility crippled for the time being. It sounds like the plant?s workers suffered through a real hellscape, too. A small fire was reported yesterday morning at the Ivanpah Solar Electric Generating ...


Bipolar current limit

Started by George Herold in sci.electronics.basics4 weeks ago 28 replies

OK this is perhaps overkill.. see footnote. So I've got an indicator LED (bi-color) the input is the error term from a thermal loop, and I turn...

OK this is perhaps overkill.. see footnote. So I've got an indicator LED (bi-color) the input is the error term from a thermal loop, and I turn that into an LED current. I was thinking it might be nice to turn up the gain on the current, but then I worried about burning out the LED with too much current from the opamp.* So I drew this up... and then added the diodes to stop the trans...


Ask a Question to the Electronics-Related community

To significantly increase your chances of receiving answers, please make sure to:

  1. Use a meaningful title
  2. Express your question clearly and well
  3. Do not use this forum to promote your product, service or business
  4. Write in clear, grammatical, correctly-spelled language
  5. Do not post content that violates a copyright