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Help Understand currentview story

http://forum.allaboutcircuits.com – In attached circuit I want to know why there is 6.5mA of current flow in 2nd leg? Shouldn't all current flow through to leg 1 (only diode attached)? Attached Images CurrentFlowLeg2.jpg (13.1 KB) (Embedded)

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unable to post with JPG imageview story

http://forum.allaboutcircuits.com – This site seems to be having issues (Embedded)

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Shipping from Chinaview story

http://forum.allaboutcircuits.com – Now I see how they do it. Received this confirmation that my $1.47 order is on the way.:) "We are excited to inform you that our Mr. Pigeon has started off and covered 25% of its journey. As stated in our auction, the shipment will take about 10-25 days during the delivery. Please be patient and wait for the arrival of your lovely item." (Embedded)

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Li-ion Pcb Charger Not Workingview story

http://forum.allaboutcircuits.com – I'm trying to charge 4 x #18650 4.2V 4.5Ah Li-Ion batteries. Like these: http://r.ebay.com/zu9OjA i'm using this charger: http://r.ebay.com/6hk1Op This charger does not appear to be working. Surely my own error. When i charge some good 18650's (not full, but have at least 3V charge), i do not see any of the batteries getting charged. (Embedded)

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Need help with variable high powered heating element using SSRview story

http://forum.allaboutcircuits.com – Hey guys I have been trying to build a controller to vary a heating element for boiling my beer mash tun. I keep running into issues. 1st issue was finding something that had no Rf interference. So I decided to go with a burst fire SSR. Second was I wanted ease of use so instead of PID I went with a resistive style SSR and a potentiometer. Heres where I am at. (Embedded)

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Best component ID web-siteview story

http://forum.allaboutcircuits.com – I recognize many electronic components, but a few still elude me. Is there a cheat sheet that I can download that has: 1. Photos 2. A brief description of the components function 3. How to test each one? Thanks, Gary My current project is to try and repair two old computer power supplies that won't turn on. (Embedded)

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Simple NPN Switchview story

http://forum.allaboutcircuits.com – I'd like to use an NPN to switch a small load, either saturated or off. In the attached circuit, +VBAT varies between 3V and 4.2V and the base logic operates at 2.8V. I'm planning to use a BC817-40 (datasheet here). My calculations are: Ic = 4.2 / 10000 = 0.42mA Ib = 2.8 / 4700 = 0.50 mA I know it's not usual to have Ib>Ic, but with Hfe of approx 400, it'll be saturated! If I'm r (Embedded)

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More free and not so free industrial surplusview story

http://forum.allaboutcircuits.com – Free "GO" power line monitor. NIB 400vac 3phase trips @ 3-4.5% unbalance in 4-5 seconds or 10% low voltage. $5.00 each: Furnas overloads. Trip levels vary. Passive current relay. Opens dry contact at set ac current level. Works with only one or two legs connected as I recall. (Embedded)

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Transistors and switchesview story

http://forum.allaboutcircuits.com – This really isn't a homework question, but more of a side project and I'm stuck. I know I need transistors maybe a timer? but I can't really wrap my head around it. (Embedded)

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RUNNING LINEAR ACTUATOR without feed backview story

http://forum.allaboutcircuits.com – Dear all. Here i am trying to do simple algorithm.I wanna formula to calculate actual position in algorithm Desired angle calculation: desired angle=-0.00227272727273x + 102.272727273 where x= (3600*hour)+(minute*60) actual angle:actual actuator stroke is 600mm ,3.2mm/sec speed ,0.192mm/min. I wanted to run actuator from morning 7 AM to 18PM. (Embedded)

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Faulty board from an electric heaterview story

http://forum.allaboutcircuits.com – Hi, please see attached picture. This came from my electric heater. The lcd display doesn't come on. The 110VAC is available and goes into the board you see and out to another board to convert to 5 and 12 vdc which gets wired back to the mainboard in picture. So I see the 5 and 12vdc and 110vac available on the mainboard, but the lcd doesn't light up and the nothing is ON. (Embedded)

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Treadmill stopped workingview story

http://forum.allaboutcircuits.com – I was pushing my nordic trac treadmill away from the wall while it was plugged in but not on. A spark came from the front where the power cord meets the motor and now it won't turn on. (Embedded)