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HarryA

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  1. Like
    HarryA got a reaction from Thatswhatshesaid in MOD-23 counter   
    The circuit below is similar to what you want to do. Using a 4 input NAND gate you can connect it to the 4 outputs that represent the valve you want.  Your NAND gate output would connect to the clr line.

  2. Like
    HarryA got a reaction from Vidyut in Could you please help me find this capacitor?   
    If it is a 120 volt Cuisinart blender then you can get one here: They ship world wide. Else search for "1 uf 250vac capacitor"
    https://www.ebay.com/itm/281873849657
    That is a horrible url !
  3. Like
    HarryA got a reaction from QiHall in Boolean Algebra   
    from Wikipedia:
     = (K+L)(K+M)(L+N)(M+P)(N+Q)(P+Q)
     = (K+LM)(N+LQ)(P+MQ)
     = (KN+KLQ+LMN+LMQ)(P+MQ)
     = KNP + KLPQ + LMNP + LMPQ + KMNQ + KLMQ + LMNQ + LMQ
    -----------------------------------------------------------------------------------------
    K * N+LQ   +  LM*(N+LQ)
    K * N+LQ = KN+KLQ    and LM*(N+LQ) =  LMN+LMQ
    for the : (KN+KLQ+LMN+LMQ)
    for the fourth line multiply the third line  by P and then by MQ from (P+MQ)
  4. Like
    HarryA got a reaction from Guy Shemesh in Help identifying electronic components   
    If you compare your  board with the one on Ebay that one looks like the better board.
    You may gain some insight by comparing the P6? on your board with the three in the schematic and see if it connects the same as one of them. This is the schematic of the Viber12a in a battery charger.

     

  5. Like
    HarryA got a reaction from Zaldy Macayan in Transistor Substitute.   
    see: https://www.nteinc.com/semiconductors/ComplPr.php    They list matched complementary pairs that maybe helpful like the NTE128/NTE129 at 80 volts and 1 ampere. And many others as well.
  6. Like
    HarryA got a reaction from fpgamall in BCD calculator (urgent help in project)   
    There is an article "Design Project2 - BCD Calculator" that maybe helpful.
    http://homepages.cae.wisc.edu/~ece352/fall02/old_project/p2.pdf
  7. Like
    HarryA got a reaction from Zahid Gul Khan in Desktop Pick and Place Machines   
    There is  information here on Visual Servoing that maybe helpful;  particularly  the numerous references at the end of the article.
    https://en.wikipedia.org/wiki/Visual_servoing
    If you look at a bmp file of a smd image like this one (I could not find an image of the bottom of a smd).
    You can see the white background as FF FF FF and one scan line across the component highlighted.  So in theory one could  find the four corners and calculated the rotation and any x y offset. In bmp files the image is inverted.
    If you only need the rotation then only part of one edge would be required to calculate it I believe.

     

    smd compoint.bmp
  8. Like
    HarryA got a reaction from Tim Swait in Intelligent power switch ESP32   
    The IPS6021 is readily available from China via Ebay.  There is a supplier in the UK also:
    https://www.ebay.com/itm/IPS6021RPBF-Intelligent-Power-Switch-High-Side-Active-High-1Output-5-5V-TO-252-5/152755283380?hash=item2390eca5b4:g:U~MAAOSwqXxdNtVK 
  9. Like
    HarryA got a reaction from gztoppower in Power supply circuit ideas   
    If you do not need SMD perhaps "The LT138A/LT338A (LM138/LM338) series of adjustable regulators provide 5A output current over an output voltage range of 1.2V to 32V."
    The LM338 is about 1$ each on ebay.
     
  10. Thanks
    HarryA got a reaction from Youssef_Hany1 in Rc car   
    Perhaps the chip is over heating with to much current draw?  Try connecting only two motors to see what happens.
    For the l298n chip itself:
    For the IO Peak Output Current (each Channel)       
    – Non Repetitive (t = 100ms)            3.0A
    –Repetitive (80% on –20% off; ton = 10ms)    2.5A
    –DC Operation                    2.0A
    TOTAL DC CURRENT UP TO 4 A 
  11. Like
    HarryA got a reaction from aleksczajka in Need Help: Bluetooth External Camera controlled by iPhone app   
    Perhaps? To big?
    " This Fujifilm FinePix digital camera has Bluetooth connectivity for wireless media transfer. "
    https://www.bestbuy.com/site/fujifilm-finepix-xp130-16-4-megapixel-digital-camera-sky-blue/6204739.p?skuId=6204739
  12. Like
    HarryA got a reaction from albarh18 in I need a critical help in designing a magic toy   
    You ask for a lot!
    Start with Ebay.com for transmitters and receivers: see:
    http://www.ebay.com/itm/Mini-88-108MHz-FM-Transmitter-Module-Wireless-Microphone-Dictagraph-Interceptor/141659602950?_trksid=p2047675.c100005.m1851&_trkparms=aid%3D222007%26algo%3DSIC.MBE%26ao%3D2%26asc%3D40832%26meid%3D5caec1e4bbe74e2fa065b6379434198a%26pid%3D100005%26rk%3D2%26rkt%3D6%26sd%3D111649741072
  13. Thanks
    HarryA got a reaction from HaddyS in Transformer Watts   
    I enlarged the image off the Amazon.com but could not read it
    https://www.amazon.com/Black-Decker-LCS1620-Lithium-battery/dp/B01M6TQPY2/ref=sr_1_3/141-0275392-4037060?ie=UTF8&qid=1499813460&sr=8-3&keywords=Black+%26+Decker+LCS1620
    ...but ebay.com has a readable image
    http://www.ebay.com/itm/Black-Decker-LCS1620-20v-20-Volt-Lithum-Ion-Battery-Charger-NEW-/272090041874?epid=1640405275&hash=item3f59d48e12:g:mf8AAOSwawpXr3eh
     
    120v @60hz 300ma
     
     
  14. Like
    HarryA got a reaction from Barbra in how to make a mailbox light? guys   
    http://www.talkingelectronics.com/projects/SolarLight/SolarCharger-2.html
  15. Like
    HarryA got a reaction from Katelynne in Transformer for voltage booster?   
    You points are well made; thanks.

    On day one I found two voltage boosters on Ebay that gave more than 100 volts so I ordered both of them from China. The first  one I received was a 12v dc to 200 v dc. After connecting it up and adjusting it for 200 v I put a 100k resistor across the output  and got 2 volts output! It took a one mega-ohm load to keep 200 v.

    The   second one (12v dc to 220 v ac) works well. I connected it to the 220v to 120v step down transformer and into a full wave bridge rectifier with a 100mfd capacitor and got 140 v dc; 9.6 volts input. With a 8.4 v NiMH rechargeable battery I get 128 v dc.
    So I am happy with that  and  very surprised that the 50/60 hertz transformer works at all!
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