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<blockquote data-quote="heka2015" data-source="post: 159243" data-attributes="member: 7351"><p>I started to get a part list together.</p><p>This is a lot of assuming here.</p><p>I really want to build this thing.</p><p>I hope you gonna work with me to get a reproducible DTG here [USER=6456]@TimeFlipper[/USER].</p><p></p><p>Let us clear some stuff up please, once and for all, for everybody, so this gets easily buildable.</p><p>I know most of the answers, but just to make sure.</p><p></p><p>IC N555</p><p>Looks like PIN 5 is not in use (not present in the schematic). So is it open or grounded with a capacitor?</p><p>Obviously open, but just to throw it out there.</p><p>[SPOILER="N555 Pin 5 INFO"]<span style="color: #000000">In the event the control-voltage pin is not used, it is recommended that it be bypassed, to ground, with a capacitor of about 0.01uF (10nF) for immunity to noise, since it is a comparator input. This fact is not obvious in many 555 circuits since I have seen many circuits with 'no-pin-5' connected to anything, but this is the proper procedure. The small ceramic cap may eliminate false triggering.</span>[/SPOILER]</p><p></p><p>CHASSIS GROUND</p><p>There are two ground symbols on the schematics.</p><p>In my world of electronics those symbols are chassis ground.</p><p>[ATTACH=full]6575[/ATTACH]</p><p>The only other thing I see connected to a chassis ground is the LED.</p><p>[ATTACH=full]6576[/ATTACH]</p><p>Now arises the question if this is wanted and the inventor planned a metal case or something and you hold it to get the ground earthed?</p><p>Or do I just overthink this, and it was ment as simple ground, to not cross lines on the schematic and thats it?</p><p>Doesn't make sense either cause there wouldn't be the one in the lower left.</p><p>Confusion i would like to clear up.</p><p></p><p>LED</p><p>If we want this to be copied and build by more people to share experiences, there should be fixed led in there with his respective resistor.</p><p>Just saying, people can figure out what to change if they have the urge to change schematics.</p><p>It should be a common basic red LED 5mm 1.8-2.2VDC Vf/ 20mA IMHO</p><p></p><p>RESISTORS</p><p>I ASSUME im alright with 0,25W Resistors, but I don't like to assume at all. lol</p><p>The 150Ω Resistor at the transistor collector base. Do we put it or not? Why the maybe for a penny item?</p><p></p><p>mA NOTE</p><p>Any reason why this is noted?</p><p>Shouldn't this be all correctly calculated already?</p><p></p><p>CAPACITORS</p><p>I know it really doesn't matter that much here.</p><p>One capacitor says 16V the rest says nothing. That confuses people. So 16V all of them and confusion eliminated?</p><p></p><p>I really want to make a sound schematic and a corresponding parts list.</p><p>Foolproof so to say.</p><p>But those are points coming up doing it.</p><p>The most confusing part are the chassis ground symbol.</p><p></p><p>P.S.:I hope I do not stress you too much [USER=6456]@TimeFlipper[/USER], and if, tell me and i''l shut up.</p></blockquote><p></p>
[QUOTE="heka2015, post: 159243, member: 7351"] I started to get a part list together. This is a lot of assuming here. I really want to build this thing. I hope you gonna work with me to get a reproducible DTG here [USER=6456]@TimeFlipper[/USER]. Let us clear some stuff up please, once and for all, for everybody, so this gets easily buildable. I know most of the answers, but just to make sure. IC N555 Looks like PIN 5 is not in use (not present in the schematic). So is it open or grounded with a capacitor? Obviously open, but just to throw it out there. [SPOILER="N555 Pin 5 INFO"][COLOR=#000000]In the event the control-voltage pin is not used, it is recommended that it be bypassed, to ground, with a capacitor of about 0.01uF (10nF) for immunity to noise, since it is a comparator input. This fact is not obvious in many 555 circuits since I have seen many circuits with 'no-pin-5' connected to anything, but this is the proper procedure. The small ceramic cap may eliminate false triggering.[/COLOR][/SPOILER] CHASSIS GROUND There are two ground symbols on the schematics. In my world of electronics those symbols are chassis ground. [ATTACH=full]6575[/ATTACH] The only other thing I see connected to a chassis ground is the LED. [ATTACH=full]6576[/ATTACH] Now arises the question if this is wanted and the inventor planned a metal case or something and you hold it to get the ground earthed? Or do I just overthink this, and it was ment as simple ground, to not cross lines on the schematic and thats it? Doesn't make sense either cause there wouldn't be the one in the lower left. Confusion i would like to clear up. LED If we want this to be copied and build by more people to share experiences, there should be fixed led in there with his respective resistor. Just saying, people can figure out what to change if they have the urge to change schematics. It should be a common basic red LED 5mm 1.8-2.2VDC Vf/ 20mA IMHO RESISTORS I ASSUME im alright with 0,25W Resistors, but I don't like to assume at all. lol The 150Ω Resistor at the transistor collector base. Do we put it or not? Why the maybe for a penny item? mA NOTE Any reason why this is noted? Shouldn't this be all correctly calculated already? CAPACITORS I know it really doesn't matter that much here. One capacitor says 16V the rest says nothing. That confuses people. So 16V all of them and confusion eliminated? I really want to make a sound schematic and a corresponding parts list. Foolproof so to say. But those are points coming up doing it. The most confusing part are the chassis ground symbol. P.S.:I hope I do not stress you too much [USER=6456]@TimeFlipper[/USER], and if, tell me and i''l shut up. [/QUOTE]
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