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HarryA last won the day on December 29 2016

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About HarryA

  • Rank
    Advanced Member
  • Birthday June 23

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  • Location
    USA, Pennsylvania, Susquehanna Cty, Forest Lake
  • Interests
    Canoeing, woodworking, electronics, and gardening.
  1. Hello, I will look at what maybe needed. I am thinking a pair of 555 timers (better but more expensive are the mc1455p timer clock chips). One for the 5 second delay which triggers the second one for the 1 minute on delay. The second one feeds a divide by 5 counter chip for the 5 minutes. For the photo cell perhaps a photo transistor. I just finished a circuit that uses a infrared television sensor to trigger a 555 chip via the television remote. You may want a breadboard and a few jumper leads. Also if you do not have any electronics instruments look for a simple logic probe circuit on the internet; it will use a led as an indicator that the timers are pulsing. It can be fabricated on one end of the breadboard. Then the devil is in the details. Perhaps we can con audioguru into helping with them; he is quite knowable. On second thought one could build LEDs into the circuit so no logic probe would be necessary.
  2. You may wish to look at: Using the TIP120 & TIP125 Darlington Transistors with Arduino https://www.youtube.com/watch?v=wxCJ9NUErwA
  3. Well already having ruined jknittandkarr's thread - sorry jknittandkarr. But another place to spent more money beyond amazon.com and ebay is at the goodwill: see "computers and electronics" off: https://www.shopgoodwill.com/listings/ Don't bid on the solar panel! I am watching
  4. Good question. I test them with my 4 of 5 stars Chinese tester I never buy anything very expensive that I could not toss out. https://www.amazon.com/gp/product/B01M0UXHYY/ref=oh_aui_detailpage_o02_s00?ie=UTF8&psc=1
  5. Yes some people have problems with parts from China but I buy a lot for China. And I never have any problems. I have two items in the "China queue" now. I call it bypassing Wal-Mart and NTE
  6. Go directly to the source: http://www.ebay.com/itm/10pcs-0-8-inch-1-digit-led-display-17-seg-Alphanumeric-Common-anode-BLUE-/311641497467?hash=item488f47df7b:g:nBAAAOSwsB9V87Ec That is where they are all made anyway.
  7. USA, State of Pennsylvania, Susquehanna County, Forest Lake Township

  8. (1)"I have an idea, but I do not know how." What is your idea? (2)"I noticed that the charger for my phone if the phone is not turned on to charge - it does not consume anything. But when I turn on the micro usb connector - then begins to consume." Find; a statement of fact. (3)"Now fit a box that will convert unbalanced audio signal into balanced. But the transformer can not fit in the box of the device and the target mount it in an external box. I do not want a permanent transformer is plugged in. " What is the relationship between sentence (2) and sentence (3)? What are trying to do in sentence (3)?
  9. I tried to buy "30v 10A 110V precision variable dc power supply ..." for 6.97$ and free shipping but it would not let me "buy it now". To good to be true? Worth that as a coffee warmer! http://www.ebay.com/itm/30V-10A-110V-Precision-Variable-DC-Power-Supply-Clip-Cable-Digital-Adjustable-S/222418872649?_trksid=p2047675.c100005.m1851&_trkparms=aid%3D222007%26algo%3DSIC.MBE%26ao%3D2%26asc%3D41394%26meid%3D98314beb8bcf41c2956f228cf09493ad%26pid%3D100005%26rk%3D5%26rkt%3D6%26sd%3D391694935441
  10. I understand. My electronic books are old enough to vote. Also I find it cost so much for the components that it is far cheaper to buy than build. For example see: http://www.ebay.com/itm/30V-5A-DC-Power-Supply-Adjustable-Dual-Digital-Variable-Precision-Lab-Grade-110V-/391378270581?hash=item5b1ff67975:g:zwcAAOSwUKxYiV76
  11. If you look at [Projects] at the top of the page you may find something helpful: Projects->Power. (Odd there is no link back to the forum page from those pages?)
  12. I am thinking these are color coded capacitors. Short of part of an early computer.
  13. There are Cannon FH7- xxxx stepper motors that are 24 volts and 1 ampere it that is any help.
  14. If you list the values of the resistors and the type of transistor then one could help you.
  15. 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