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9Comments福岡県 北部九州沿海部
北部九州アラフィフ(Around 50)の波乗りオヤジ。波がないときは家庭菜園で有機野菜を作り、かみさん子供と庭でバーベQ。第三のビール風飲料と芋焼酎のロックが大好きなちょっとメタボなトドお父さん。玉子に薀蓄。タマゴかけごはん愛好会 会員番号 100012
  • Dirt cheap ATtiny-85 Tv-B-Gone(switches off any TV!), plus arduino as isp

    Hi there,I'd tried to make this project this weekend.Actually as other trialer, I encountered how to burn the tvbgone11.hex firmware to ATTINY85 thrugh ArduinoISP writer.Luckily, I found by google how to make it.① find avrdude.exe and avrdude.conf (maybe in arduino/bin/ folder)② move hex file to C:/ root folder③ Open Dos window command prompt④ move to avrdude directry,⑤ type avrdude -c avrisp -P COM4 -b 19200 -p t85 -U flash:w:.tvbgone11.hex(change COM port # or hex file name and path)It was not enjoyable how to burn the firmware , but eventually I had doneby "はやねさん工房” information. Thanks a lot はやねさん!!http://blog.livedoor.jp/hymne333/archives/4710525....And thank you very much for your uploading Saral-san!Regards,I

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  • powpher commented on newtonn2's instructable DIY Small Bench Power Supply 6 months ago
    DIY Small Bench Power Supply

    Hi, Folks good evening !I would like to explain silicon gel type heat sink.I attached a silicon gel seat under the PCB to the case.It has soft thin seat and adhesive both side then it is easy to cut and stick.There are many vendors producing such seats in Japan. ( pls google it)But I geuss it is gradually getting easy to get them because the some heat sink for recent CPUs or GPUs are adopting those gel seat now.The advantage is easy to attach and easy to settle the case becase it is softthen just tighten by nut and screw like my posting photo !It is actually good heat conductive even if contact is not so accurate. (I recomend 1mm to 1.5mm thick type to tighten by screw.)And I would llike to show you LED control pwb, too.It is dirty wiring as you see it but it works!Best regards,

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  • powpher commented on newtonn2's instructable DIY Small Bench Power Supply 7 months ago
    DIY Small Bench Power Supply

    Hi, gkal-sanGood day to you.I'm so sorry that I didn't read your previous comment carefully.You already understood threshold toggle voltage problem.And I think your amendment is very good solution.One attiny85 for both CC/CV sensing and Load on/off sensing is very simple.(//minimum voltage = 1.17V at Load on/off sw on. CC/CV=3.06V to aprox. 0V )Oppositely,I solved it both by +0.7V NPN analog circuit. Anyway, It will be better if a little original idea was added to a base design.I hope that our struggle will be some help for other guys try.Best regards, and your good DIY life !

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  • powpher commented on newtonn2's instructable DIY Small Bench Power Supply 7 months ago
    DIY Small Bench Power Supply

    Hi, gkal-sanHow are you doing ?I've just finished this project and now I probably answer your question.Usually, CMOS circuit like atttiny85 has basicaly 1/2Vcc threshold.Pls refer to sparkfan learning site regarding TTL and Arduino threshold.https://learn.sparkfan.com/tutorials/logic-levelsIt describes usual AVR CPU using 5V Vcc has 3.0V Vih, therefore 3.08Vis very critical to sense as "H" level. (it means sometime OK, but sumotime NG, unstable. no margin)The simple solution is to ochange Vcc to 3.3V, then Vih is going down to 2V.The other solution is to use analog input (I don't sure attny has analog input.). But I chose NPN trangister circuit instead that has 0.7V Vih. Best regards, and enjoy your DIY life!

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  • powpher commented on newtonn2's instructable DIY Small Bench Power Supply 7 months ago
    DIY Small Bench Power Supply

    Hi, there?I would like to explain PNP to NPN circcuit.Atached LTSpice schematic is both NPN and PNP.Next pics are both PNP and NPN LED switcing circuit simulation results.They would show you threshold difference.The PNP circuit has Vcc-0.7V(=Vbe) threshold. If Vcc is 5V, the thresh is 4.3V.If this case, the voltage of CV/CC LED on voltage is approx. 3.3V then it wouldn't turn off. The voltage of CV/CC LED off voltage is approx. 0V, therefore NPN circuit is better for this application. ( I guiss Load on/off switch sensing circuit is also same situation. )When load ciorcuit is connected, Sense voltage begin from lowest 1.25V.If output voltage was set under threshold voltage, load on sensing doesn't work. Therefore NPN circuit which has +0.7V threshold would be better when you would rep...see more »Hi, there?I would like to explain PNP to NPN circcuit.Atached LTSpice schematic is both NPN and PNP.Next pics are both PNP and NPN LED switcing circuit simulation results.They would show you threshold difference.The PNP circuit has Vcc-0.7V(=Vbe) threshold. If Vcc is 5V, the thresh is 4.3V.If this case, the voltage of CV/CC LED on voltage is approx. 3.3V then it wouldn't turn off. The voltage of CV/CC LED off voltage is approx. 0V, therefore NPN circuit is better for this application. ( I guiss Load on/off switch sensing circuit is also same situation. )When load ciorcuit is connected, Sense voltage begin from lowest 1.25V.If output voltage was set under threshold voltage, load on sensing doesn't work. Therefore NPN circuit which has +0.7V threshold would be better when you would replace Tiny 85 to transistor circuit.I suppose another solution for this probrem is to choose lower Vcc like 3.3V.How about that ?

    Hi, there?I would like to explain PNP circuit converted to NPN circuit.Attached LTSpice schematic is both NPN and PNP.Next pics are both PNP and NPN LED switching circuit simulation results.They would show you threshold difference.The PNP circuit has Vcc-0.7V(=Vbe) threshold. If Vcc is 5V, the thresh is 4.3V.If this case, the voltage of CV/CC LED on voltage is approx.3.3V then it wouldn't turn off.The voltage of CV/CC LED off voltage is approx. 0V, therefore NPN circuit is better for this application. ( I guess Load on/off switch sensing circuit is also same situation. )When load circuit is connected, Sense voltage begin from lowest 1.25V.If output voltage was set under threshold voltage, load on sensing doesn't work.Therefore NPN circuit which has +0.7V threshold would be better when y...see more »Hi, there?I would like to explain PNP circuit converted to NPN circuit.Attached LTSpice schematic is both NPN and PNP.Next pics are both PNP and NPN LED switching circuit simulation results.They would show you threshold difference.The PNP circuit has Vcc-0.7V(=Vbe) threshold. If Vcc is 5V, the thresh is 4.3V.If this case, the voltage of CV/CC LED on voltage is approx.3.3V then it wouldn't turn off.The voltage of CV/CC LED off voltage is approx. 0V, therefore NPN circuit is better for this application. ( I guess Load on/off switch sensing circuit is also same situation. )When load circuit is connected, Sense voltage begin from lowest 1.25V.If output voltage was set under threshold voltage, load on sensing doesn't work.Therefore NPN circuit which has +0.7V threshold would be better when you would replace Tiny 85 to transistor circuit.I suppose another solution for this problem is to choose lower Vcc like 3.3V.How about that ?

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  • powpher commented on newtonn2's instructable DIY Small Bench Power Supply 7 months ago
    DIY Small Bench Power Supply

    Thank you your very good porject.Inspiered by your posting, I've started very similler DC supply by tracing your project and just finished.Thre are several changes from your original design.First diffrence is front panel design.I substitute just to stick printed label paper on the enclosure.(This is useful also marks for drilling the case. But easy to dirt lol.) Next difference is limiting warning circuit.I substitute the same circuit as your output on/off circuit.(PNP circuit has VCC -0.7V threthold. then I changed to NPN.)Lastly, I used 1mm gel silicon sheet instead of alminium for heat sink. When testing, unfortunately one of chinese potentiometeres are broken.As you also know, it needs a few weeks to get replace parts, then I substituted usual volume pod.It works fine for current l...see more »Thank you your very good porject.Inspiered by your posting, I've started very similler DC supply by tracing your project and just finished.Thre are several changes from your original design.First diffrence is front panel design.I substitute just to stick printed label paper on the enclosure.(This is useful also marks for drilling the case. But easy to dirt lol.) Next difference is limiting warning circuit.I substitute the same circuit as your output on/off circuit.(PNP circuit has VCC -0.7V threthold. then I changed to NPN.)Lastly, I used 1mm gel silicon sheet instead of alminium for heat sink. When testing, unfortunately one of chinese potentiometeres are broken.As you also know, it needs a few weeks to get replace parts, then I substituted usual volume pod.It works fine for current limting porpose, but I don't recommend for Voltage Control because it was very critical to adjust.Anyway, thank you very much for your posting. I'm very satisfied your Tiny DC supply project !! (^u^)I'm now testingand aging the Tiny DC supply and waiting another pottentiometersdelivery from China! BTW If you can, could you tel me how to shorten pottentiometers knob?

    Thank you your very good porject.Inspiered by your posting, I've started very similler DC supply by tracing your project and just finished.Thre are several changes from your original design.First diffrence is front panel design.I substitute just to stick printed label paper on the enclosure.(This is useful also marks for drilling the case. But easy to dirt lol.) Next difference is limiting warning circuit.I substitute the same circuit as your output on/off circuit.(PNP circuit has VCC -0.7V threthold. then I changed to NPN.)Lastly, I used 1mm gel silicon sheet instead of alminium for heat sink. When testing, unfortunately one of chinese potentiometeres are broken.As you also know, it needs a few weeks to get replace parts, then I substituted usual volume pod.It works fine for current l...see more »Thank you your very good porject.Inspiered by your posting, I've started very similler DC supply by tracing your project and just finished.Thre are several changes from your original design.First diffrence is front panel design.I substitute just to stick printed label paper on the enclosure.(This is useful also marks for drilling the case. But easy to dirt lol.) Next difference is limiting warning circuit.I substitute the same circuit as your output on/off circuit.(PNP circuit has VCC -0.7V threthold. then I changed to NPN.)Lastly, I used 1mm gel silicon sheet instead of alminium for heat sink. When testing, unfortunately one of chinese potentiometeres are broken.As you also know, it needs a few weeks to get replace parts, then I substituted usual volume pod.It works fine for current limting porpose, but I don't recommend for Voltage Control because it was very critical to adjust.Anyway, thank you very much for your posting. I'm very satisfied your Tiny DC supply project !! (^u^)I'm now testingand aging the Tiny DC supply and waiting another pottentiometersdelivery from China! BTW If you can, could you tel me how to shorten pottentiometers knob?

    Thank you your very good porject.Inspiered by your posting, I've started very similler DC supply by tracing your project and just finished.Thre are several changes from your original design.First diffrence is front panel design.I substitute just to stick printed label paper on the enclosure.(This is useful also marks for drilling the case. But easy to dirt lol.) Next difference is limiting warning circuit.I substitute the same circuit as your output on/off circuit.(PNP circuit has VCC -0.7V threthold. then I changed to NPN.)Lastly, I used 1mm gel silicon sheet instead of alminium for heat sink. When testing, unfortunately one of chinese potentiometeres are broken.As you also know, it needs a few weeks to get replace parts, then I substituted usual volume pod.It works fine for current l...see more »Thank you your very good porject.Inspiered by your posting, I've started very similler DC supply by tracing your project and just finished.Thre are several changes from your original design.First diffrence is front panel design.I substitute just to stick printed label paper on the enclosure.(This is useful also marks for drilling the case. But easy to dirt lol.) Next difference is limiting warning circuit.I substitute the same circuit as your output on/off circuit.(PNP circuit has VCC -0.7V threthold. then I changed to NPN.)Lastly, I used 1mm gel silicon sheet instead of alminium for heat sink. When testing, unfortunately one of chinese potentiometeres are broken.As you also know, it needs a few weeks to get replace parts, then I substituted usual volume pod.It works fine for current limting porpose, but I don't recommend for Voltage Control because it was very critical to adjust.Anyway, thank you very much for your posting. I'm very satisfied your Tiny DC supply project !! (^u^)I'm now testingand aging the Tiny DC supply and waiting another pottentiometersdelivery from China! BTW If you can, could you tel me how to shorten pottentiometers knob?

    View Instructable »