tag:blogger.com,1999:blog-8226950546477403054.post3059024054847312809..comments2018-11-14T07:45:07.176+05:30Comments on Homemade Circuits Projects: What is Constant Current Source - Facts ExplainedSwagatamnoreply@blogger.comBlogger19125tag:blogger.com,1999:blog-8226950546477403054.post-76405498416055551462017-11-05T16:30:03.000+05:302017-11-05T16:30:03.000+05:30Hi.Im looking for timer for egg turner mechine.. 8...Hi.<br>Im looking for timer for egg turner mechine.. 8hour interval and 3 seconds run. Can u make 6 pcs and supply. Please do call me on 8494915158.<br>Thanx<br>AsifAsifnoreply@blogger.comtag:blogger.com,1999:blog-8226950546477403054.post-54047972204159148272017-11-05T22:10:45.000+05:302017-11-05T22:10:45.000+05:30Hi, sorry, I won't be able to provide practica...Hi, sorry, I won't be able to provide practical samples...Swaghttps://homemade-circuits.com/noreply@blogger.comtag:blogger.com,1999:blog-8226950546477403054.post-55690356078563275892017-11-07T06:54:55.000+05:302017-11-07T06:54:55.000+05:30Do u know anybody who can supply these units.Do u know anybody who can supply these units.Asifnoreply@blogger.comtag:blogger.com,1999:blog-8226950546477403054.post-36414883354124417882017-11-07T15:34:44.000+05:302017-11-07T15:34:44.000+05:30sorry, I don't know anyone else who can do thi...sorry, I don't know anyone else who can do this in my rangeSwaghttps://homemade-circuits.com/noreply@blogger.comtag:blogger.com,1999:blog-8226950546477403054.post-43672133962193487852017-12-11T18:25:52.000+05:302017-12-11T18:25:52.000+05:30Hi Swagatam, I want to use the constant current...Hi Swagatam,<br> <br> I want to use the constant current circuit with 3.7v. 250MA Does it works? or if you have any other circuit to solve my purpose.<br><br>since i had used LM317 in Constant current configuration but it doesn't work.<br><br>ThanksGanesh Tripathinoreply@blogger.comtag:blogger.com,1999:blog-8226950546477403054.post-67002334875831594472017-12-11T23:15:39.000+05:302017-12-11T23:15:39.000+05:30Hi Ganesh, if you are referring to the first circu...Hi Ganesh, if you are referring to the first circuit, then yes it will definitely work for your application, and an LM317 circuit will also definitely work provided you calculate the resistor correctly.<br><br>remember there are many duplicate versions of the IC flooded in the market which may not work, so make sure you buy the original one....Swaghttps://homemade-circuits.com/noreply@blogger.comtag:blogger.com,1999:blog-8226950546477403054.post-11604264442206989412018-01-17T03:20:22.000+05:302018-01-17T03:20:22.000+05:30so according to what i understand is, once Rx is s...so according to what i understand is, once Rx is set say we want 2amps in the load so Rx will be 0.35 ohms, so the moment the current tries to exceed this cc range, the base of the 2n222 is triggered due to the voltage developed according to ohms law. am i right ? if yes, then the voltage across the base/emitter of the 2n222 will be at 0.7 at all values of threshold current, then it means 2n222ABBAnoreply@blogger.comtag:blogger.com,1999:blog-8226950546477403054.post-88045143595099594412018-01-17T14:14:37.000+05:302018-01-17T14:14:37.000+05:30during an over current situation as soon as the 2N...during an over current situation as soon as the 2N2222 triggers it switches OFF the TI122 which in turn removes the 0.7V potential from the 2N2222 base, and this allows TIP122 to conduct, this again causes an overload at the output triggering ON the 2N2222 and switching OFF TIP122...the cycle keeps repeating at an extremely rapid rate which ultimately attains a steady state wherein the load is Swaghttps://homemade-circuits.com/noreply@blogger.comtag:blogger.com,1999:blog-8226950546477403054.post-22051931435481124662018-01-18T15:08:16.000+05:302018-01-18T15:08:16.000+05:30thanks now i understandthanks now i understandABBAnoreply@blogger.comtag:blogger.com,1999:blog-8226950546477403054.post-13083690693820016702018-06-03T22:38:57.000+05:302018-06-03T22:38:57.000+05:30Whats the max current that can be supplied using a...Whats the max current that can be supplied using above ckt?Ajinkyanoreply@blogger.comtag:blogger.com,1999:blog-8226950546477403054.post-23367770813212609022018-06-04T00:12:36.000+05:302018-06-04T00:12:36.000+05:305 amp for the first circuit, if IC LM196 are used ...5 amp for the first circuit, if IC LM196 are used it becomes 10 amps max.Swaghttps://www.homemade-circuits.com/noreply@blogger.comtag:blogger.com,1999:blog-8226950546477403054.post-74398947916495300602018-06-05T08:06:14.000+05:302018-06-05T08:06:14.000+05:30Ok,but won't 10A require quite a high watt reg...Ok,but won't 10A require quite a high watt register.Are those available in market notmally?What about tip122/2n2222 ckt.That would also require high watt resistor I suppose.Ajinkyanoreply@blogger.comtag:blogger.com,1999:blog-8226950546477403054.post-24998577342290579862018-06-05T14:09:59.000+05:302018-06-05T14:09:59.000+05:30yes for the first circuit if LM196 is used, the R1...yes for the first circuit if LM196 is used, the R1 could require a 10 watt resistor.<br>however in the the transistor based circuit the resistor value will be rather smaller, it could be around 0.6 x 10 = 6 wattsSwaghttps://www.homemade-circuits.com/noreply@blogger.comtag:blogger.com,1999:blog-8226950546477403054.post-83125854757411495002018-06-30T06:52:48.000+05:302018-06-30T06:52:48.000+05:30hi Mr...1. i wish to build this circuit with singl...hi Mr...<br>1. i wish to build this circuit with single 3 watt led (Luxeon 3) on 220volt ac in every room... and also my citchen set.. so i hope this circuit could to make smaller size PCB and also cheapest cost exactly<br>2. if it possible what the value of resistor and wattage to change/Remove 10K VR because only will get fixed output 3,6 Volt 700mA.<br>3. could to change TIPP 122 with other hilmannoreply@blogger.comtag:blogger.com,1999:blog-8226950546477403054.post-40443459154643231202018-06-30T18:00:57.000+05:302018-06-30T18:00:57.000+05:30Hi Hilman, TIP122 is recommended for efficient cur...Hi Hilman, TIP122 is recommended for efficient current transfer, but you can try a TIP31 instead, and check if its works.<br>Please tell me the input voltage value for calculating the resistor values.<br>Rx = 0.6/LED currentSwaghttps://www.homemade-circuits.com/noreply@blogger.comtag:blogger.com,1999:blog-8226950546477403054.post-75063040304930933742018-07-01T10:17:19.000+05:302018-07-01T10:17:19.000+05:30input voltage is from accu 6v/7,2AH and li ion 186...input voltage is from accu 6v/7,2AH and li ion 18650 battery.<br> i don't yet try transformerless PSU shown diagram above coz i assume max current will be no more than 100mA, and there is no stock TIP122 at store. i'm still looking for it at the other storehilmannoreply@blogger.comtag:blogger.com,1999:blog-8226950546477403054.post-7070023614048443932018-07-01T15:54:08.000+05:302018-07-01T15:54:08.000+05:30Here's the formula for calculating resistor di...Here's the formula for calculating resistor divider network<br>Vout = Vin.R2 / R1 + R2 <br><br>Vout = 6R2 / 1000 + R2<br><br>4.5 = 6R2 / 1000 + R2<br>4.5(1000 + R2) = 6R2<br>4500 + 4.5R2 = 6R2<br>450 = 6R2 - 4.5R2 = 1.5R2<br>R2 = 4500/1.5 = 3000 ohms<br><br>3000 ohm will be the resistor which could be replaced with the shown 10K presetSwaghttps://www.homemade-circuits.com/noreply@blogger.comtag:blogger.com,1999:blog-8226950546477403054.post-47281692474992880842018-08-24T23:00:51.000+05:302018-08-24T23:00:51.000+05:30Hello Sir,I have a built a project which includes ...Hello Sir,<br>I have a built a project which includes many transducers and sensors which are driven by two DC-DC Converters having output ratings of 24V, 50W and 5V, 50W.<br>I have a task to implement a circuit which senses the current drawn from these converters, an indication (LED) which shows that the current drawn is exceeding the threshold value (just as the CC mode of Regulated Power SupplyPrathamnoreply@blogger.comtag:blogger.com,1999:blog-8226950546477403054.post-19644785376660315482018-08-24T23:21:11.000+05:302018-08-24T23:21:11.000+05:30Hello Pratham,you can try the following concept wi...Hello Pratham,<br><br>you can try the following concept with some modifications:<br>https://www.homemade-circuits.com/mains-over-load-protector-circuit-for/<br><br>1) replace the LED/LDR hand made opto coupler with any other ready made opto coupler<br>2) Replace the 220V input with converter input.<br>3) Connect the transducer to the relay output<br>4) Connect the +12V of the circuit with the Swaghttps://www.homemade-circuits.com/noreply@blogger.com