LF Spectrum Analyser

Started by Clive Arthur in sci.electronics.design55 minutes ago 6 replies

Any recommendations for a spectrum analyser, say =1MHz, maybe USB, hopefully inexpensive, definitely available now, in the UK? Aaronia any...

Any recommendations for a spectrum analyser, say =1MHz, maybe USB, hopefully inexpensive, definitely available now, in the UK? Aaronia any good? Not generally very good reviews, but people here may know better. Cheers -- Clive


Zenering a big transistor

Started by George Herold in sci.electronics.design1 hour ago 50 replies

I'm using a TIP31C (pnp in to-220 pac) as a temp sensor (diode connected) There's a couple of depletion fets in series as current limiters....

I'm using a TIP31C (pnp in to-220 pac) as a temp sensor (diode connected) There's a couple of depletion fets in series as current limiters. (LND150) The b-e junction starts to zener at ~30 V (only two tested so far). So I've got ~1.5 mA flowing at 30 V. Is this going to damage the junction? Will it take time? I'm going to measure forward voltage again after zenering for 15 minutes. Sho...


eighty dollar dip SSR

Started by John Larkin in sci.electronics.design1 hour ago 22 replies

http://www.mouser.com/ProductDetail/Teledyne-Relays/ZD20CFW/?qs=0J2cNUgg5d8fhxqXylHZwg%3D%3D -- John Larkin Highland...

http://www.mouser.com/ProductDetail/Teledyne-Relays/ZD20CFW/?qs=0J2cNUgg5d8fhxqXylHZwg%3D%3D -- John Larkin Highland Technology, Inc picosecond timing precision measurement jlarkin att highlandtechnology dott com http://www.highlandtechnology.com


Can tact switches be under permanent pressure?

Started by Joerg in sci.electronics.design2 hours ago 24 replies

Can simple tact switches be under permanent depression for days or weeks without some spring in there wearing out? This...

Can simple tact switches be under permanent depression for days or weeks without some spring in there wearing out? This kind: https://media.digikey.com/Photos/TE%20Connectivity/FSM6JH_tmb.jpg I'd like to use them as end switches. The end switches on our Genie garage door openers contain those flimsy open metal contacts. Every few months a door bangs hard against a stop because the cont...


(burglar) Alarm systems

Started by Don Y in sci.electronics.design2 hours ago 32 replies

What's the *minimal* STEADY STATE user interface for an alarm system? - mechanism to arm/disarm (keypad, keylock, etc.) - indicator for...

What's the *minimal* STEADY STATE user interface for an alarm system? - mechanism to arm/disarm (keypad, keylock, etc.) - indicator for armed/disarmed - indicator/annunciator for tripped/reset Of course, the indicators should also give some information regarding transitions between states (e.g., armING vs armED or DISarmed; tripPING vs. tripPED or reset; etc.) Indicators/controls beyond t...


Power Meter Warning

Started by Sylvia Else in sci.electronics.design3 hours ago 6 replies

I have one of these: http://www.arlec.com.au/wp-content/files/PC222.pdf In the instructions there, and on the device itself, there is a...

I have one of these: http://www.arlec.com.au/wp-content/files/PC222.pdf In the instructions there, and on the device itself, there is a warning: "WARNING: DO NOT PLUG TWO OR MORE METERS TOGETHER." What could be the issue with plugging two together? Or are they concerned that people will notice the lack of consistency in the readings? Sylvia.


OT: Canada and Gender Pronouns

Started by Jim Thompson in sci.electronics.design3 hours ago 76 replies

Since Canadians can no longer cope with just she/he/it I'll guess we'll just have to make up a contraction that fits all... ...

Since Canadians can no longer cope with just she/he/it I'll guess we'll just have to make up a contraction that fits all... s'he'it > :-} ...Jim Thompson -- | James E.Thompson | mens | | A


OT: Echoes of Kevin Aylward...

Started by Jim Thompson in sci.electronics.design3 hours ago 17 replies

OT: Echoes of Kevin Aylward... ...Jim Thompson -- | James E.Thompson ...

OT: Echoes of Kevin Aylward... ...Jim Thompson -- | James E.Thompson | mens | | Analog Innovations | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | STV, Queen Creek, AZ


OT: Tesla Road Test

Started by rickman in sci.electronics.design4 hours ago 165 replies

I test drove a model X today. It's a pretty impressive car! I used the auto feature a bit, but it takes a bit of getting used to. The car...

I test drove a model X today. It's a pretty impressive car! I used the auto feature a bit, but it takes a bit of getting used to. The car will change lanes when you press the turn signal and the salesman wanted to show me how it wouldn't make the lane change when a car was in the way. But my instinct kicked in before the car's did and I turned the wheel back to my lane. Same with th...


PC timing problem

Started by John Larkin in sci.electronics.design6 hours ago 66 replies

Today a couple of guys literally walked up to our place and rang the doorbell, looking for help. They are medical types who know...

Today a couple of guys literally walked up to our place and rang the doorbell, looking for help. They are medical types who know basically nothing about electronics. They want to plop a still image on a PC screen and simultaneously trigger some external gear. They would like those to be coincident to within maybe a millisecond. This will be a Windows machine, hardly a realtime OS. I do...


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