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PCB manufacture options

Started by bitrex in sci.electronics.design6 months ago 6 replies

I'd like to get some evaluation boards assembled for an SPLD design, to provide to potentially interested clients. I don't have lot of...

I'd like to get some evaluation boards assembled for an SPLD design, to provide to potentially interested clients. I don't have lot of experience using assembly houses, can anyone give a ballpark of what price I'd be looking at and where would be good to look? The requirements are pretty modest. 2 layer board maybe about 3 cm by 3cm with one or two STQFN20, couple SOIC-8s, couple SOT-36...


1 V oscillator.

Started by none in sci.electronics.design6 months ago 71 replies

I'm sitting on a heap of germanium transistors. From the time that computers made of discrete germanium transistors were decommissioned. Also 10...

I'm sitting on a heap of germanium transistors. From the time that computers made of discrete germanium transistors were decommissioned. Also 10 mm and 6 mm ferrite core. Can I make on oscillator, that runs on 1V , preferably using coils ? (Also trying to use LTSpice for the first time.) I can measure inductance of coils thanks to the miracle component testers from China. Groetjes Albert ...


Can't find clearcut instructions that work for resetting Mikrotik RB411 routerboard to 192.168.88.1

Started by RJH in sci.electronics.design6 months ago 11 replies

I know it was working when I put it in the storage box years ago. But I don't remember what IP address it was set to at that time. The 18VDC...

I know it was working when I put it in the storage box years ago. But I don't remember what IP address it was set to at that time. The 18VDC 1Amp POE is known to be good & the RB411 lights & beeps when it's powered (although I'm not sure what's supposed to light up). I went to the firmware download page (which shows it's discontinued) and read every document there and tried all their rese...


O/T but funny: Bard gives gambling advice

Started by RichD in sci.electronics.design6 months ago 7 replies

"I am playing a fair even money game flipping coins. My opponent cannot quit. I intend to quit any time I get one bet ahead. Do I have an...

"I am playing a fair even money game flipping coins. My opponent cannot quit. I intend to quit any time I get one bet ahead. Do I have an advantage?" Bard: Yes, you do have an advantage in this scenario. Here's why: Limited downside: Since you are guaranteed to quit after winning one bet, your maximum possible loss is limited to losing your initial bet. Unlimited upside: Your potential ...


RC [High|Low]-Pass Filter -- bit of a sanity check

Started by Dan Purgert in sci.electronics.design7 months ago 9 replies

[From the "I know just enough to be dangerous" department :)] Thanks to Don, I've got an upgrade in the works for my project to make the...

[From the "I know just enough to be dangerous" department :)] Thanks to Don, I've got an upgrade in the works for my project to make the "daughtercard" a little smarter / easier. First pass here, I'm trying to see if I can get away with the ATTiny10 on the board, because that SOT-23-6 package is nice and tiny. However, this means I technically only have three easily-available I/O pins (...


Some Quick And Dirty Boards for a Tabletop Game Idea

Started by Dan Purgert in sci.electronics.design7 months ago 62 replies

Kind of a fun idea I had (actually a few months ago) to create a bit of an augmented experience when playing Dungeons and Dragons (or, well, I...

Kind of a fun idea I had (actually a few months ago) to create a bit of an augmented experience when playing Dungeons and Dragons (or, well, I suppose any tabletop / Pen & Paper RPG that happens to use a 1" grid, but I play D&D, so ... this is where I'm focused ;) ). Came across 3d-printable projects for making various tile-sets (think dungeons / caverns / taverns / etc. ) and after printin...


ECM 3.0 motor speed controls

Started by bob prohaska in sci.electronics.design7 months ago 5 replies

I have an old HVAC blower motor which was removed from a Carrier air handler on grounds it was defective. It's half horsepower, with ECM 3.0...

I have an old HVAC blower motor which was removed from a Carrier air handler on grounds it was defective. It's half horsepower, with ECM 3.0 controls. It has an AC input for motor power and a four pin control connector marked common, Rx, Tx and V+. Physically it's in perfect shape. On the bench it seems to work fine. The test procedure applies 24 VAC between common and Rx, the motor sof...


Sphere Research Corporation (BC) going out of business.

Started by John Robertson in sci.electronics.design7 months ago 2 replies

A number of us here, I'm sure, have used Sphere's web site (located in Kamloops BC) for either finding odd test gear or parts to fix same. Or...

A number of us here, I'm sure, have used Sphere's web site (located in Kamloops BC) for either finding odd test gear or parts to fix same. Or nixie tubes and other odds and ends... https://www.sphere.bc.ca/ Unfortunately the owner (Walter Shawlee II) has to shut the site down and liquidate all inventory due to illness - a sad day indeed! So if you have a big truck, I suggest driving...


LTSpice - Am I blind?

Started by Dan Purgert in sci.electronics.design7 months ago 9 replies

Got it installed with wine here on my PC. Fonts are a bit wonky, but that happens from time to time, so not going to really bother with...

Got it installed with wine here on my PC. Fonts are a bit wonky, but that happens from time to time, so not going to really bother with it. Took things for a spin by trying to build your basic low-pass filter as one might see on a momentary-contact button (etc.). Thing is, I wasn't seeing any "switch" or "button" type symbols -- am I just blind, and missed them somewhere in the myriad ...


Sound on my new radio is muffled.

Started by micky in sci.electronics.design7 months ago 73 replies

I bought a $230 wifi radio that is impressive in many ways, but the problem I have is that the sound sounds muffled Maybe it's okay for music....

I bought a $230 wifi radio that is impressive in many ways, but the problem I have is that the sound sounds muffled Maybe it's okay for music. I haven't listened to much music, but for talk it sounds muffled. Like literally they are talking through some sort of muffle. I don't have this problem with 5 other table radios. Is the problem that there is too much bass? If not that, what?...


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