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[00:18:22] <katsmeow-afk> US $10.00 + US $7.05 shipping
[00:18:22] <katsmeow-afk> Order 3500 ~ TOSHIBA # TC74VHC573FT
[00:18:32] <katsmeow-afk> not $50
[00:54:11] <katsmeow-afk> http://www.ebay.com/itm/281469913706
[01:18:05] <rue_shop2> katsmeow-afk, katsmeow-afk katsmeow-afk
[01:18:07] <rue_shop2> katsmeow-afk, katsmeow-afk
[01:18:09] <rue_shop2> kat
[01:18:13] <rue_shop2> kat kat kat
[01:18:17] <rue_shop2> kat kat
[01:18:17] <katsmeow-afk> rue rue?
[01:18:33] <rue_shop2> I got an idea
[01:18:45] <katsmeow-afk> that's nice
[01:18:49] <rue_shop2> instead of making the ramp out of an oscillator with the c tapped
[01:19:12] <rue_shop2> I use a 555 and run an RC off the digital output to slew it into a triangle!
[01:19:22] <rue_shop2> then the timing wont F#@$%$#! up
[01:19:29] <katsmeow-afk> won't be linear
[01:19:57] <katsmeow-afk> use the square to gate the current source and the capacitor ground transistor
[01:22:00] <rue_shop2> its not too important for it to be linear
[01:22:10] <rue_shop2> right now I have RC charge shapes
[01:25:37] <katsmeow-afk> ok
[01:37:51] <katsmeow-afk> ........
[01:37:59] * rue_shop2 throws the 555 across the room and digs out a 1Mhz crystal...
[01:38:14] <katsmeow-afk> how did the 555 fail ?
[01:38:17] * rue_shop2 throws the crystal and programs a tiny13 to output 1Mhz square wave
[01:38:33] * rue_shop2 throws the tiny13 and uses a gps with a pll on the output
[01:38:42] <katsmeow-afk> <blink>
[01:38:47] * rue_shop2 looks around the shop for an atomic clock
[01:39:00] <rue_shop2> ok wait, I think this is scope runaway
[01:39:39] <katsmeow-afk> what's that?
[01:40:06] <katsmeow-afk> using a lanborgini to pull a plow?
[01:40:59] * rue_shop2 stares at the 100Khz crystals he has
[01:41:03] <rue_shop2> well,
[01:41:11] <rue_shop2> the 55 is being finiky and unstable
[01:41:25] <rue_shop2> if I'm looking fora 250Khz square wave, it can come form anyhting
[01:42:28] <rue_shop2> oh... 455Khz resonators
[01:42:45] <rue_shop2> /2 is 227.5..
[01:43:11] <rue_shop2> 227.5Khz is pretty close to 250Khz
[01:43:29] <rue_shop2> :o
[01:43:33] <rue_shop2> a 500Khz one!
[01:44:14] <rue_shop2> wtf used a 500khz IF?
[01:44:37] <rue_shop2> oo I have 2!
[01:46:30] <rue_shop2> :/ looks like one is shot
[01:46:39] <rue_shop2> katsmeow-afk, do you know what used 500Khz?
[01:49:02] <rue_shop2> half my 7474 is free to divide it too
[01:49:35] <katsmeow-afk> sideband radios, i expect
[01:49:55] <katsmeow-afk> 455 was very common, but only in cheaper am radios
[01:50:44] <katsmeow-afk> it may have been a unin in an experiemntal am-sterio reciever
[01:50:55] <katsmeow-afk> to broadent he if bandpass
[01:51:35] <katsmeow-afk> my olde Eico tube amp had am-stero input jacks
[01:51:41] <katsmeow-afk> and knob position
[01:54:33] <katsmeow-afk> https://duckduckgo.com/?q=%22500khz+IF%22+radio
[01:54:34] <katsmeow-afk> https://www.google.com/search?q=%22500khz+IF%22+radio&ie=utf-8&oe=utf-8
[01:54:44] <katsmeow-afk> 632 hits
[01:58:46] <katsmeow-afk> The older receivers with an IF of around 465kHz always employed two RF stages and the second-channel interference then only became unacceptable above about 30MHz. If the IF was 1.6MHz, one RF stage could be considered to be adequate.
[01:59:16] <katsmeow-afk> One solution to this problem is the 'double superhet', having two different intermediate frequencies. The first is fairly high, typically 1.6 to 3MHz for good image performance; this is then converted by means of a second mixer and local oscillator to a second IF which is low to provide high selectivity. The second IF may be as low as 50 to 100kHz.
[01:59:52] <rue_shop2> ... its the servo boards of old vcrs, they have some REALLY odd ones
[02:00:04] <rue_shop2> most at 400Khz, some 500, some 800, one 497
[02:01:06] <rue_shop2> AN6342 looks like a nice sip osc module
[02:03:08] <rue_shop2> oh, its got a divider
[02:06:54] <rue_shop2> katsmeow-afk, can I do a 1 transistor osc for a resonator?
[02:07:00] <rue_shop2> at 5V single supply
[02:08:08] <katsmeow-afk> yeas
[02:08:55] <katsmeow-afk> if you have a resonator, why not drive it with leftover pins on the 7414 ?
[02:09:41] <rue_shop2> it'll do that?
[02:09:56] <rue_shop2> never tried with a schmidtt
[02:10:00] <katsmeow-afk> with appropriate caps and r's , sure
[02:10:17] * rue_shop2 imagines a network of 50 resistors
[02:10:17] <katsmeow-afk> you don't need the 14, use a 04
[02:10:24] <rue_shop2> like to keep this small
[02:10:37] * katsmeow-afk shakes her head
[02:10:37] <rue_shop2> transistors a SIP3 :)
[02:10:58] <rue_shop2> I can makea 7404 into a SIP7
[02:12:30] <rue_shop2> hmm, if I get a transistor one to work, I might have to play with the output elvels to get it into a 7474
[02:13:34] <katsmeow-afk> right
[02:14:03] <rue_shop2> ah 4069 is what I was thinking in the back of my mind
[02:14:40] <rue_shop2> http://www.bowdenshobbycircuits.info/oscilate.gif
[02:14:46] <rue_shop2> think that one on the right is stable?
[02:14:49] <rue_shop2> 3.3M
[02:16:09] <rue_shop2> http://www.oscilent.com/esupport/TechSupport/ReviewPapers/IntroQuartz/vigfig13.gif
[02:16:12] <rue_shop2> COOL CHART!
[02:16:28] <katsmeow-afk> the cmos invertors will give yo a better 50-50 duty cycle, and less dc across the ctrysal
[02:16:52] <rue_shop2> but where do I find a SIP 4 pin inverter
[02:17:12] <rue_shop2> okok try this one
[02:17:14] <katsmeow-afk> 74hcG1o4
[02:17:31] <rue_shop2> off the top of your head, what are the output pins of a 4069
[02:17:50] <rue_shop2> the right two gates are backwards??...
[02:17:58] <katsmeow-afk> i didn't use cmos way back when
[02:18:03] <rue_shop2> !?
[02:18:08] <rue_shop2> I thought it was all the rage
[02:18:13] <katsmeow-afk> cept for the 4013, a coule others
[02:18:28] <katsmeow-afk> i needed speed, the fastest ttl was 74LS
[02:18:38] <rue_shop2> https://i1.wp.com/www.pbase.com/daverichards/image/158738690/original.jpg
[02:18:39] <katsmeow-afk> that generllay tpped out at 30Mhz
[02:18:42] <rue_shop2> I like having values
[02:19:19] <rue_shop2> not fond of the fixed bias
[02:19:53] <rue_shop2> remove the 1k and use a larger in place of the 4.7k but go to the emitter?
[02:19:57] <rue_shop2> er 10k
[02:19:59] <katsmeow-afk> that is an osc?
[02:20:09] <katsmeow-afk> it has no feedback from the collector
[02:20:17] <rue_shop2> the calacitor divider
[02:20:38] <rue_shop2> its a colpitts
[02:21:06] <katsmeow-afk> i am not good with nicks
[02:21:15] <rue_shop2> me either, I used that chart
[02:22:02] <rue_shop2> I suppose I should just build it
[02:22:31] <rue_shop2> http://www.simplecircuitdiagram.com/wp-content/uploads/2010/01/JFET-Pierce-Crystal-Oscillator.gif
[02:22:35] <rue_shop2> wait, less parts!
[02:22:40] <rue_shop2> I have some jfets
[02:22:55] <rue_shop2> which is B1 and which is B2?
[02:23:29] <rue_shop2> how many turns around a 10M resistor is that RFC :)
[02:23:43] <rue_shop2> from what I'v seen 'lots' works
[02:25:52] <rue_shop2> http://i.imgur.com/MSy0e.png
[02:25:54] <rue_shop2> hahahahhahahaha
[02:25:56] <rue_shop2> hahahha
[02:26:01] <rue_shop2> technically,.... sure...
[02:35:19] <rue_shop2> how do you think I can tell if the drive current is too high thru the crystal?
[02:39:28] <katsmeow-afk> use as litle as you need to make it osc
[02:40:12] <katsmeow-afk> too much can make it put out the wrong freq
[02:40:38] <katsmeow-afk> or make it's reponce too broad
[02:41:32] <katsmeow-afk> i do not understand why you are having so much trouble
[02:41:48] <katsmeow-afk> yu have kids tomorrow?
[02:44:30] * katsmeow-afk wavers gnites
[12:03:02] <any46349197> "so when he said he wanted "a bowl a soup" , you gave him Ebola soup?"
[12:03:06] <any46349197> that is all
[20:09:45] <katsmeow> need any rambus mobo sockets?
[22:03:49] <rue_shop3> hey
[22:03:56] <rue_shop3> not I, no
[22:04:05] <rue_shop3> I reimplemented the whole pwm conveter in CMOS
[22:04:15] <rue_shop3> the logic output is clean as a whistle
[22:04:26] <rue_shop3> and the driver chip output rings like crazy
[22:04:34] <rue_shop3> just about to try antoher chip
[22:04:41] <rue_shop3> whole thing in CMOS...
[22:05:17] <katsmeow> sure, you are well below a Mz
[22:09:50] <rue_shop3> hmm,
[22:10:20] <rue_shop3> 8-| I think only half these fet drivers can operate without ringing badly
[22:10:39] <katsmeow> use chokes?
[22:11:24] <katsmeow> btw, a long time "power seller" sent me a reel of chokes labled 74HCT245
[22:11:34] <katsmeow> i asked for my moneys back
[22:14:59] <rue_shop3> hahahhahahaha
[22:15:12] <rue_shop3> I didn't ground the probe again, rining was just in the ground
[22:15:27] <katsmeow> ah
[22:18:06] <rue_shop3> however, the fet driver dosn't play nice with the 4093 I have operating it :(
[22:18:23] <katsmeow> how to eliminate most ringing: build the circuit on a bnc connector, and plug it right into the scope face
[22:18:31] <rue_shop3> but, since this is all cmos now, I think I can run it all at 12V and not need the level shifter for the fet driver
[22:18:44] <rue_shop3> kinda, its only 250Khz
[22:18:46] <rue_shop3> er, less
[22:18:54] <rue_shop3> I took a 455khz resonator
[22:19:05] <katsmeow> i took a vitamin pill
[22:19:13] <rue_shop3> /2 to get 227khz, which I'm calling close enough to 250
[22:19:46] * katsmeow nods
[22:20:08] <rue_shop3> the cmos waves are all nice and roundy
[22:20:18] <rue_shop3> but seem to be keeping their intrgrity
[22:20:45] <katsmeow> the power fets will ignore the roundy tops and bottoms, so you're good there
[22:21:14] <rue_shop3> they dont ignore ringing tho, and all the drivers, so far, are ringing
[22:21:21] <katsmeow> you will stillneed current boosters, cmos logic isn't known for driving capacitors as loads
[22:21:29] <rue_shop3> yea
[22:21:36] <rue_shop3> and the boosters are gonna ring
[22:21:37] <katsmeow> grond your probe
[22:21:50] <katsmeow> put .1 and .01 caps across all chips
[22:22:08] <rue_shop3> did, just as you get to about 0.5% duty, it glitches out
[22:22:17] <katsmeow> you should have under 0.1v of ringing on anything
[22:22:23] <rue_shop3> I wonder if I buffer it again...
[22:22:40] <rue_shop3> gonna close my eyes for a second..
[23:21:47] <rue_house> this computer did not like its last upgrades
[23:23:29] <katsmeow> oh
[23:23:40] <katsmeow> you made it inside with yur eyes closed!
[23:24:00] <rue_house> about once a year the video card locks up and I need to reboot
[23:24:13] <rue_house> last night I was listening to the card thinking the fan needs service
[23:24:28] <rue_house> the reboot tripped a bunch of reset configs
[23:24:35] <katsmeow> just blow the cat and bear hair out of it
[23:24:37] <rue_house> so it came back all unconfigured
[23:27:44] <rue_house> mmm something still seems different and I cant place it
[23:40:41] <katsmeow> try a crowbar
[23:44:42] <rue_house> zener or otherwise?
[23:45:40] <katsmeow> no, to place the puter in a different position, gives lots of leverage
[23:52:44] <rue_house> ah
