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a big trick of solid state amps vs old tube amps is that it used to be "How much voltage can you swing out of this tube collector" and then impedance transform it down to 8 ohms. With solid state poo poo, current delivery capability is _eeeeeverything_. You can make a transistor amp that'll swing whatever volts but since we don't use output transformers any more, the current you get is the current you get, and amps are what provides the thump and the power.
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Mar 30, 2018 03:48
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uh oh, the linear regulator's pins don't fit in wire wrap sockets. how am i going to get power to all my ICs!
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Mar 30, 2018 04:34
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Trig Discipline posted:drunkposting another thing for the thing i enjoyed this
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Mar 30, 2018 05:34
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Luigi Thirty posted:uh oh, the linear regulator's pins don't fit in wire wrap sockets. how am i going to get power to all my ICs! solder the regulator next to a strip of wire wrap socket posts and bend the leads over so you can solder them to the base of the post. leaves less room for wrapping connections onto the post, but you can add more rows of wire wrap posts like so: code:
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Mar 30, 2018 05:45
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Trig Discipline posted:drunkposting another thing for the thing I hate to just chime in with a ditto but I really enjoyed this. The lyrics posted really helped. My ears are broken (like literally don't work right, I'm a cyber-man who needs machines to hear) and while I can still enjoy music I would not have had a hope of making out the words myself but reading along lets my brain click the two together Yeah I really enjoyed it 
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Mar 30, 2018 06:48
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BobHoward posted:solder the regulator next to a strip of wire wrap socket posts and bend the leads over so you can solder them to the base of the post. leaves less room for wrapping connections onto the post, but you can add more rows of wire wrap posts like so: ah, of course. turn the perfboard into an inverted breadboard and give myself all the connections i need
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Mar 30, 2018 07:13
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Mister Sinewave posted:I hate to just chime in with a ditto but I really enjoyed this. thanks a bunch! getting the vocoded lyrics even semi-comprehensible is always a challenge, so i have to post lyrics or my aunt will immediately post "i can't understand the lyrics" on my facebook. she does the same with identifying any species of bird in any picture i post. she's a sweetheart, but she's also a bit of a chore sometimes
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Mar 30, 2018 07:39
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Finished off the refurbishment of my Atari 1040STf Here's what it looked before:   After:   Bonus Amiga A1200 photo:  The Atari powers up, but waiting on a cable order to come in so I can see if it displays video.
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Mar 31, 2018 14:08
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fortunately, like the old amigas, it's pretty simple inside and easy to repair if there is a problem. if anything goes bad it's generally the shifter (from heat, it's in a little metal can) and you can just buy replacements from ebay
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Mar 31, 2018 22:20
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i got to know the M4's DSP instructions and made the core of the mixer in assembly. > Channel mixed in 1856 cycles (14.5 cycles/sample). maybe i can afford reverb after all 
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Mar 31, 2018 23:01
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Daisy chaining power = bad but I can daisy chain signals right? I have my two ROMs and two RAMs next to each other and want to connect their address pins together. I’d be going CPU -> ROM -> ROM -> SRAM -> SRAM.
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Apr 1, 2018 01:50
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Luigi Thirty posted:Daisy chaining power = bad but I can daisy chain signals right? I have my two ROMs and two RAMs next to each other and want to connect their address pins together. I’d be going CPU -> ROM -> ROM -> SRAM -> SRAM. yeah that should be fine btw the power thing isn't like super bad to violate here and there, it's just an easy rule of thumb to follow which avoids potential issues
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Apr 1, 2018 02:33
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BobHoward posted:yeah that should be fine yeah i saw a post from someone like "i daisy chained all the power pins together on my design and at the end the +5V was down to 3.1V" obviously that's not an issue if the chips consider anything over like 2V as a logical 1 and i'm wiring 4 chips together with an inch of wire combined
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Apr 1, 2018 03:03
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Yeah having one long power trace that ends up being 1m long because it snakes all over the place is bad, but sharing one trace between half a dozen chips is fine. For signals traces likes address and data lines you don't have to worry about it because there's no real current flowing and that's the thing that causes a voltage drop.
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Apr 1, 2018 12:31
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well you do have to worry about creating an antenna if you make it too long and meandering
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Apr 1, 2018 19:51
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true. but does that really start affecting anything until you get to higher frequencies (30mhz+?) and start pushing the limits with respect to chip timing? for an example of sharing power traces this BBC Micro board has ~100 chips on it. all the power pins are chained together (it's the thicker trace you can see here and there near most chips), and the 5V power supply is just connected to that one long trace in three positions - once at each end and once in the middle. 
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Apr 1, 2018 20:29
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I finally got an RPI streaming a nice webcam that I have. The framerate is terrible but the webcam has a fun fisheye lens and always has this moody look about it. Believe it or not the four little cores on the RPI and that GPU do a fine job transcoding to MPEG4 for low enough resolutions.
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Apr 2, 2018 03:34
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Sweevo posted:true. but does that really start affecting anything until you get to higher frequencies (30mhz+?) and start pushing the limits with respect to chip timing? As long as there's sufficient decoupling, it should be good up significantly higher than that. (See: an orange local decoupling cap at the + rail of every chip.) If you aren't doing RF tx/rx, it's just good design practice tho, right?
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Apr 2, 2018 08:41
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yeah I’m running the board at an 8MHz master clock so it should be okay the CMOS 68Ks I bought are 16MHz parts but I’ve only got 8 and 10MHz crystals and the MFP needs a 4MHz clock Luigi Thirty fucked around with this message at 08:54 on Apr 2, 2018 |
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Apr 2, 2018 08:52
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Luigi Thirty posted:yeah i saw a post from someone like "i daisy chained all the power pins together on my design and at the end the +5V was down to 3.1V" well... putting on the pedant hat it's not just about successful chip-to-chip communication. chip designers close timing assuming worst case process corners, temps, and supply voltages (PVT). typical 5v chips are rated +/- 10% power supply voltage so anything less than 4.5V risks the guts of the chip hitting unpredictable weird bugs like many things there's often enough margin that you can get away with small violations, especially on older technologies and when not running at full speed. 3.1v probably didn't go well though, lol modern chips are crazy in this regard. got a cpu whose core runs at ~1.0V and consumes ~100W? cool, that means 100A supply current. even over just an inch or two distance, at 100A, IR droop is a hell of a thing. there are seriously fascinating engineering challenges designing the system to maintain proper voltage regulation at the core so the processor doesn't glitch the gently caress out all the time
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Apr 2, 2018 11:01
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Spatial posted:i got to know the M4's DSP instructions and made the core of the mixer in assembly. sweet
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Apr 2, 2018 18:28
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i made a new album https://dumbledog.bandcamp.com/album/disciples-of-euclid-pt-4
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Apr 3, 2018 15:02
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i figured out how to make metallic clangs in vcv so far lmbo anyway I hooked up the barrel jack and regulator to the proto board and... I’m getting 13V in and 2.4V out. on a 9V transformer going to a 5V regulator with nothing hooked up to it, just an output pin wired to a header and the ground pin tied to, uh, ground. what the hell electricity
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Apr 3, 2018 16:40
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you got filter caps on that regulator? possible its oscillating
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Apr 3, 2018 16:45
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Sometimes adapters don't output right unless they are loaded but that still sounds kind of hosed up.
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Apr 3, 2018 19:17
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Jonny 290 posted:you got filter caps on that regulator? possible its oscillating yeah, same as on my breadboard... i’ll check the wiring again and make sure nothing’s shorted I can check it out with my scope too, and hook up an LED
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Apr 3, 2018 22:02
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well I've got an idiot sparetime project https://twitter.com/SilverAlicorn/status/981331828572172288
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Apr 4, 2018 01:49
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Silver Alicorn posted:well I've got an idiot sparetime project nice! i've got a couple little all-in-one macs, they're real cute. fun fact: at the time, Mac model names had an "X" meaning they had a full 68030. this would mean the SE with 68030 would be the... SE/X. they wisely chose not to do that. oh yeah, my other idiot sparetime project: my brother's monitor died and he can't afford a new one. my dad brought over the power board and it's got some bad caps on it. new monitor: $100 new caps: $1 so we're gonna recap it next time i need to order something from mouser!
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Apr 4, 2018 04:07
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Any recommendations for a shenzhen special hot air rework station? currently looking at an "898D+" which has a crappy soldering iron as well
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Apr 4, 2018 04:14
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Silver Alicorn posted:Any recommendations for a shenzhen special hot air rework station? currently looking at an "898D+" which has a crappy soldering iron as well don't get that one, get the 858D theres a thread on the eevblog forums about it but basically its pretty good out of the box (depending on your luck) and quite a few of them have a micro controller than can be popped out and replaced with a new board that adds a lot of functionality https://oshpark.com/profiles/GiantGnome https://github.com/madworm/Youyue-858D-plus 30 TO 50 FERAL HOG fucked around with this message at 04:49 on Apr 4, 2018 |
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Apr 4, 2018 04:46
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gah i think i burned out the regulator soldering things to it, that's the problem there's like no space left on the board for power stuff. i think i might have to put the MFP on a breakout board and just use some ribbon cable to connect it to the main board. i mean that wouldn't be the worst thing to do, i have a bunch of spare headers i can use.
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Apr 4, 2018 05:21
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NEED MORE MILK posted:don't get that one, get the 858D fine ordered caps & some tools, will see how this goes
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Apr 4, 2018 06:11
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whats the recommendation for an arm programmer? i think i want something that does jtag and swd and i'm not too fond of the segger educational licensing crap vs the regular $300 or whatever price tag. apparently st-link will program other than st chips? linux support would be nice to have, and i think my budget is maybe $40
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Apr 4, 2018 06:21
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stlink will work with the full connector. you might want to look into mbed boards and see if you can make do with a cable off one of them.
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Apr 4, 2018 06:24
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Its amazing how much of the cheapo Chinese Hobbyist Electronics stuff is really on par with some expensive US stuff. I have the Shenzen hot air station and its comparable to a professional one I've used.hifi posted:whats the recommendation for an arm programmer? i think i want something that does jtag and swd and i'm not too fond of the segger educational licensing crap vs the regular $300 or whatever price tag. apparently st-link will program other than st chips? linux support would be nice to have, and i think my budget is maybe $40 Beaten but STLink, they have a couple cheap USB ARM Programmers, and STLink has decent Linux support. https://github.com/texane/stlink
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Apr 4, 2018 13:29
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checking my purchase history, I appear to have bought an entire electronics workshop
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Apr 4, 2018 13:39
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welp, looks like I learn to solder now. there doesn't seem to be any combination of parts available that can do everything I want without it
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Apr 4, 2018 15:44
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CommieGIR posted:Its amazing how much of the cheapo Chinese Hobbyist Electronics stuff is really on par with some expensive US stuff. I have the Shenzen hot air station and its comparable to a professional one I've used. how does that compare to openocd's stlink support? i found a segger in a drawer at work and use that, but my coworkers use openocd and an stlink and it seems hit or miss.
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Apr 4, 2018 16:55
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haveblue posted:welp, looks like I learn to solder now. there doesn't seem to be any combination of parts available that can do everything I want without it get a temp controlled iron, a hakko style tip cleaner, a sucker and some wick from the get and you won't have any problems
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Apr 4, 2018 17:01
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muckswirler posted:get a temp controlled iron, a hakko style tip cleaner, a sucker and some wick from the get and you won't have any problems
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Apr 4, 2018 17:12
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