This thread was added for people that find useful circuits or other thing that will possibly help others in their quest and design of circuit boards and timing devices. please feel free to post a circuit that you think will benefit others in the future. try to describe the circuit and it's function as to help others identify it's need in their project.
This first circuit is use for timing purposes with an alternative to the 555 timer. many times a Schmitt trigger inverter can be used to build a timing circuit that has a much squarer signal that may be needed with less complex circuit.
here is a 741 variation that has adjustable capacitance and resistance to alter the frequency. it have a much sharper waveform then that of a 555 timer.
here we have an adjustable power supply that can supply up to 15 amp with voltage adjustment to from 4.5 to 25 volts
i will add much more circuits as i have downloaded many on my computer which i will slowly post them.if you have a useful circuit please post it for others to enjoy.
Post by Marathonman on Jan 6, 2020 12:55:08 GMT -6
Here is a very useful and simple induction heater that can be used for many things even to heat the water in an Aquaponic system in the winter time to protect the fish and microbes. with a metal pipe in place of a iron piece in between the poles that water will be heated very fast. it could even be used to heat chemicals flowing though the pipe or other things.
all that one needs is an additional heater control like below or other heating system circuits.
I know that i will be trying to use this type of system in an Aquaponic system to heat water in the winter.
Post by Marathonman on Jan 6, 2020 13:05:53 GMT -6
Here is a useful Wheatstone circuit to control a circuit that is light controlled with attached relay to handle higher loads of AC or DC. position of LDR to adjustable resistor can be swapped to control of either day or night switching with just a swap of the LDR and the Potentiometer.
Post by Marathonman on Jan 8, 2020 10:40:38 GMT -6
Here is an interesting reluctance or rather magnetic motor with the possibility of BEMF recovery. this motor has the ability to yank your arm off if you try to stop it. could be of some very good uses in the future when i move to a sustainable community.
Here is another magnetic motor from a book from 1910 or so with the same properties as above.
Post by Marathonman on Jan 9, 2020 13:24:05 GMT -6
Here is a few more nice circuits that can come in handy.
totally self explanitory, everyone could use a buck or boost circuit at one time or another.
Very low power high side switching circuit for use with all Arduinos and Mcu's.
Interesting high side switching using an opto isolator. if you need higher voltage then that you can use an SFH619A which makes them 200 and 300 volts maximum. TIP31 can be replaced will a powerhouse transistor according to your needs. the Zener diode is used to keep the gate at 10 volts or so as the resistor arrangement is a voltage divider.
Post by Marathonman on Jan 21, 2020 14:29:41 GMT -6
Here is a very interesting circuit that very well might fit your bill. this is something i came up with last year or the year before. i have not tested it but in theory it should work allowing no voltage drop like that of a bridge diode. if anyone has any comments please feel free to tell me about concerns or feasibility. it uses P channel mosfets connected to the negative side to turn on for both sets. there actually is no negative in the universe just current traveling in two different directions alternating.
Post by Marathonman on Jan 21, 2020 14:34:05 GMT -6
Here is another very interesting device. it seams it uses a magnet attracted to a core and coil which is switched at almost top dead center to repell the magnetwich will continue through the stroke. i would love to build it but no funds.
Post by Marathonman on Jan 22, 2020 9:56:41 GMT -6
The iron pipe is solid iron not laminated so there will be lots of eddy currents in it which causes friction as the magnetic domains are switched back and forth thus producing heat and transferred to the water. the transformer being laminated will not heat up like the pipe will. this is in place of G in the diagram. it would even be better if you can find a 400 hz core that way the pipe or what ever you have between the transformer poles will heat up rather fast. the circuit to control this is rather straight foreword and simple. it would be to one's advantage to put some kind of heat shield to protect the transformer or around the pipe like a ceramic cylinder or collar.
Post by Marathonman on Jun 27, 2020 21:01:15 GMT -6
Here is the ambient lighting i am working on to light up Van Camper number signs on the ranch. wire looks huge on tiny board but it is stranded 18 awg. resistors are being changed to smaller wattage as these were on hand. this will allow it to fit in the battery and electronic case from all electronics. batteries are in 26650 single battery holder with solder pins.
Simple circuit that is no bigger then your thumb yet solar charges the battery then activates at night. if you look close you can see Vapcell 26650 battery @ 3.7 v 5300 mah for 5 bucks a piece from this online dealer. Vapcell Link they are direct from Vapcell and the price can NOT BE BEAT BY ANYONE.
these are so awesome and stay on all night long with 4 led's with a voltage drop of only .10 volts. measured at 3.61v, 12 hrs later 3.51v. PS. makes for an awesome flashlight battery.