pointers to transistor (semiconductor) curve tracer circuits/projects

Started by Anonymous in sci.electronics.design4 hours ago 138 replies

I find myself in a situation where I am repairing some high end audio amps and cassette decks that have house numbered semiconductors, mainly...

I find myself in a situation where I am repairing some high end audio amps and cassette decks that have house numbered semiconductors, mainly transistors as well as JDEC p/n that are NLA. I have found a few transistors that are dead and need to be replaced. Fortunately, they are in parts of the amp where the other channel has an identical transistor. Having one transistor as a bas


OT: 2020 Election

Started by Cursitor Doom in sci.electronics.design4 hours ago 4 replies

If this proven loser bitch gets another shot at the presidency in 2020, then IMO serious questions need to be asked about how one person can...

If this proven loser bitch gets another shot at the presidency in 2020, then IMO serious questions need to be asked about how one person can acquire so much influence over the Democratic Party, clearly against its own best interests. https://www.zerohedge.com/news/2018-11-11/wsj-calls-it-hillary-will-run- again-2020 -- This message may be freely reproduced without limit or charg...


Floating digital pot query.

Started by Clive Arthur in sci.electronics.design6 hours ago 12 replies

I have a small-signal amplifier with adjustable gain and HF lift which uses digital pots. It's differential, actually a few identical stages....

I have a small-signal amplifier with adjustable gain and HF lift which uses digital pots. It's differential, actually a few identical stages. At high lifts, there's more noise than I'd like. To cut a long story short, I can very much improve it by reconfiguring the lift digipot (actually used as a variable resistor) and associated components, but the upshot is that the digipot element ...


Pocket Radio Amplification Factor

Started by Robert Martin in sci.electronics.design16 hours ago 14 replies

Does anyone know what the RF amplification factor might be in a pocket radio like...

Does anyone know what the RF amplification factor might be in a pocket radio like this? https://www.ebay.com.au/itm/Super-Audio-Bass-Mini-Speaker-TF-USB-AUX-USB-FM-AM-Radio-MP3-LED-Lig ht-W-Cable/153215613030?hash=item23ac5cb866:m:m_si40_E_26Kd5-ffiAwawg Robert Martin


amazing ARB pricing

Started by John Larkin in sci.electronics.design20 hours ago 63 replies

...

https://www.amazon.com/Adoner-Precision-Arbitrary-819214bits-Modulation/dp/B07BF7Y7TJ/ref=sr_1_3 ?ie=UTF8&qid=1540502597&sr=8-3&keywords=fy6600&dpID=41vbYI%252B7YiL&preST=_SX342_QL70_&dpSrc=src h Other places have this box for $99. -- John Larkin Highland Technology, Inc picosecond timing precision measurement jlarkin att highlandtechnology dott com http://www.highlan


Saturation NI of a plate inductor

Started by Piotr Wyderski in sci.electronics.design23 hours ago

Hi, assume a coil of N turns was wound with a foil around the longest edge of a PLT43/28/4.1 ferrite plate. The inductance can be easily...

Hi, assume a coil of N turns was wound with a foil around the longest edge of a PLT43/28/4.1 ferrite plate. The inductance can be easily measured, but do you know of a reasonably accurate method to predict the saturation magnetic field strength of this configuration? I'm not sure I should follow the usual short gap heuristic in such an extreme case. There is suprisingly little in the Int...


Using cordless tool batteries to power a drone

Started by John Doe in sci.electronics.design1 day ago 36 replies

Disclaimer: I'm not looking for the best drone power supply. I enjoy using high quality branded products. Of course it's all made in China....

Disclaimer: I'm not looking for the best drone power supply. I enjoy using high quality branded products. Of course it's all made in China. That is IMO a good reason to pay close attention to branding. I intend to pay VERY close attention to my battery pack temperature, and to take the endeavor very slowly. I have a spare Dewalt 20 V Max 6 amp hour battery, and a load of new 18650 bat...


ODB++ PCB CAD Data

Started by Anonymous in sci.electronics.design1 day ago

I am having an old board made and am being asked for ODB++ format CAD data files. It seems this is to facilitate the creation of the various...

I am having an old board made and am being asked for ODB++ format CAD data files. It seems this is to facilitate the creation of the various machine control files. I'm told it can also support locating traces to assist in debugging. My CAD package doesn't support this. Would it be a hard thing for the developers to add? https://www.odb-sa.com/wp-content/uploads/odb_spec_user-


Probate question

Started by TTman in sci.electronics.design1 day ago 4 replies

There is a question on the forms asking about Aunts and Uncles of the deceased. In my case I have no idea whether or not there are/were any....

There is a question on the forms asking about Aunts and Uncles of the deceased. In my case I have no idea whether or not there are/were any. Other elderly relatives are not sure either . What are the implications if I get this wrong ? I find the questions re all relatives pointless as there is a clear will in place. I can understand the need here if someone dies intestate..... Whilst do...


Driving to a Hydrogen Future

Started by Anonymous in sci.electronics.design2 days ago 90 replies

Hydrogen and Fuel Cell Day took place earlier this month (10/08), atomic weight H is...

Hydrogen and Fuel Cell Day took place earlier this month (10/08), atomic weight H is 1.008. https://www.energy.gov/articles/driving-hydrogen-future


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