You cannot "harvest" the back emf! This is nonsense. The back emf only exists when you put energy into an electrical machine (motor).The back emf is always less than the applied voltage (otherwise it is a generator that you have). These guys are kidding themselves.
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The guy clearly dont know anything in electronic with video like that, with a bedini setup , the transistor never open to full power consumption, the Amp at the base is low so the output is low (HFE 25->45 max) at the collector but if you short directly the coil across the battery , its normal that the transient spike will be bigger, you have saturated the core.
@IceStorm5555 I agree this is inaccurate conclusion NPN chip is a gate that is controlled ,and a direct open switch of current cannot be compared to a gated one so you are correct IceStorm555, so who ever posted this video on overuintydotcom should pull this video and not propagate misinformation.
The Coil is saturated in both setups 1 & 3 (Transistor and Switch) since the bulb in the "ON moment" reaches the same brightness in both setups (1 & 3). + the Amp draw is the same in both setups (1 & 3). The Transistor gets more than enough power to open full in (almost) the same time as the physical switch, this I conclude from the brightness of the bulb in the "ON moment". Only when the "OFF moment" occures there is a extrem difference between setup 1 & 3. TheGuru2You
how many ways are you wrong ! fucking expensive on transistors . Back EMF gain, what the fucken' hell does that mean
nedladdy 1 month ago
You cannot "harvest" the back emf! This is nonsense. The back emf only exists when you put energy into an electrical machine (motor).The back emf is always less than the applied voltage (otherwise it is a generator that you have). These guys are kidding themselves.
sorova 3 months ago
Other Infos:
My Back EMF testresults with Condensator 1000V 20µF:
To picture 1: Transistor charged a Condensator to maximum of 7 Volts only in less than 1 Seconds. I used a PWM with frequenzy controll set at 100Hz.
To picture 2: Transistor (Bedini) charged a Condensator to maximum of 130 Volts in about 5 Seconds. I used a bedini "motor" running at 15Hz (900RPM)
To picture 3: The switch charged a Condensator to maximum of 410 Volts in only 2-3 Seconds. I switched manualy at about 2Hz.
TheGuru2You 1 year ago
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TheGuru2You 1 year ago
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Free energy can change the world!But some very powerfull ppl don't want you and me to be free from energy costs,Check this free energy magnet motor at LT-MAGNET-MOTORdotCOM ,Let the revolution begin!
checksummedchest 1 year ago
The guy clearly dont know anything in electronic with video like that, with a bedini setup , the transistor never open to full power consumption, the Amp at the base is low so the output is low (HFE 25->45 max) at the collector but if you short directly the coil across the battery , its normal that the transient spike will be bigger, you have saturated the core.
Best Regards,
IceStorm
IceStorm5555 1 year ago
@IceStorm5555 I agree this is inaccurate conclusion NPN chip is a gate that is controlled ,and a direct open switch of current cannot be compared to a gated one so you are correct IceStorm555, so who ever posted this video on overuintydotcom should pull this video and not propagate misinformation.
zeropointfuel 1 year ago
@zeropointfuel
The Coil is saturated in both setups 1 & 3 (Transistor and Switch) since the bulb in the "ON moment" reaches the same brightness in both setups (1 & 3). + the Amp draw is the same in both setups (1 & 3). The Transistor gets more than enough power to open full in (almost) the same time as the physical switch, this I conclude from the brightness of the bulb in the "ON moment". Only when the "OFF moment" occures there is a extrem difference between setup 1 & 3. TheGuru2You
TheGuru2You 1 year ago