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J
john
Guest
yes!
it irratates me when people say \"every thing that can be invented hes been invented.\" however mealy mouthed they are about it.
to make a magamp oscillator you will need;
1) a meadium resister
2) enough suitable wire to wind 3 equal coils
3) (1 bitt core ) 1 torroidal core and 1 broken torroidal core, that can be glued on to the side of the compleat torroid to make a bitorroidal transformer core with air gaps.
onto the common leg of the bitt core wind the main coil, conect one end the the battery the other end becomes the ac out put on a dc bias.
the second coil is wound on the main torroid, so as to oppose the direction of the magnetic flux from the main coil, when it is conected via the resister to the lead from the battery.
the third (comtrole) coil is wound onto the air gapped leg of the bitt core. it is in series with the second coil and is wound so as to further desaturate the core through the main coil. and conected back to the opposit side of the battery.
electricaly that is;
battery, main coil, the ac outout is between the end of that coil and the battery.
battery, resister, second coil, third coil, battery.
the action
the power is switched on, the flux in the torroidal side of the bitt gose towards saturation. the transformer action between the main coil and coil 2 stops any corrent flowing through the resister, or that circuit.
the core saturates, there is no more transformer action, the curent flows through coils 2 and 3 starting to desaturate the core. increasing the resistance in the main coil.
by transformer action the falling curent in the main coil increases the current in coils 2 and 3, driving the core towards saturation in the revers direction.
the core saturates and the dc curent from the battery through the main coil becomes dominant and the cycle repeats.
this might be useful for thing like electric car in hot climbets.
--
For full context, visit https://www.electrondepot.com/electrodesign/magamp-oscillator-783971-.htm
it irratates me when people say \"every thing that can be invented hes been invented.\" however mealy mouthed they are about it.
to make a magamp oscillator you will need;
1) a meadium resister
2) enough suitable wire to wind 3 equal coils
3) (1 bitt core ) 1 torroidal core and 1 broken torroidal core, that can be glued on to the side of the compleat torroid to make a bitorroidal transformer core with air gaps.
onto the common leg of the bitt core wind the main coil, conect one end the the battery the other end becomes the ac out put on a dc bias.
the second coil is wound on the main torroid, so as to oppose the direction of the magnetic flux from the main coil, when it is conected via the resister to the lead from the battery.
the third (comtrole) coil is wound onto the air gapped leg of the bitt core. it is in series with the second coil and is wound so as to further desaturate the core through the main coil. and conected back to the opposit side of the battery.
electricaly that is;
battery, main coil, the ac outout is between the end of that coil and the battery.
battery, resister, second coil, third coil, battery.
the action
the power is switched on, the flux in the torroidal side of the bitt gose towards saturation. the transformer action between the main coil and coil 2 stops any corrent flowing through the resister, or that circuit.
the core saturates, there is no more transformer action, the curent flows through coils 2 and 3 starting to desaturate the core. increasing the resistance in the main coil.
by transformer action the falling curent in the main coil increases the current in coils 2 and 3, driving the core towards saturation in the revers direction.
the core saturates and the dc curent from the battery through the main coil becomes dominant and the cycle repeats.
this might be useful for thing like electric car in hot climbets.
--
For full context, visit https://www.electrondepot.com/electrodesign/magamp-oscillator-783971-.htm
A
Anthony William Sloman
Guest
On Wednesday, November 4, 2015 at 6:50:53â¯AM UTC+11, amdx wrote:
<snip>
Cores don\'t saturate at a particular current, but at particular number of ampere-turns. If you can wind enough turns of very fine wire around your core, 0.40mA would saturate it. 50A/metre is a ball-park figure. For an RM8 core the magnetic path length is about 40mm so 2Ain one turn would do it, or 0.4ma in 10,000 turns - which would be down close to 0.1mm OD enameled copper wire on an RM 8 core, which is finer than I could wind. Professional coil winders could do it,.
--
Bill Sloman, Sydney
On 11/3/2015 12:03 PM, Piotr Wyderski wrote:
legg wrote:
<snip>
I don\'t know if this is helpful, but here is an oscillator that runs on 5.5mv B+. So it doesn\'t take much wiggle to work, now you just need
to find out how to wiggle it with out the FETs.
Needs a core that will saturate at less than 0.40 ma somewhere. ;-)
Cores don\'t saturate at a particular current, but at particular number of ampere-turns. If you can wind enough turns of very fine wire around your core, 0.40mA would saturate it. 50A/metre is a ball-park figure. For an RM8 core the magnetic path length is about 40mm so 2Ain one turn would do it, or 0.4ma in 10,000 turns - which would be down close to 0.1mm OD enameled copper wire on an RM 8 core, which is finer than I could wind. Professional coil winders could do it,.
--
Bill Sloman, Sydney
L
legg
Guest
On Sun, 21 May 2023 14:30:04 +0000, john
<1877948422cb8be02cf5175c606bf923@example.com> wrote:
Your link is to a \'mirrored\' SED thread that\'s 7 years ols.
Your description is of magnetic material and copper wire
that does NOTHING, given the manual power switch as its
only active element.
RL
<1877948422cb8be02cf5175c606bf923@example.com> wrote:
yes!
it irratates me when people say \"every thing that can be invented hes been invented.\" however mealy mouthed they are about it.
to make a magamp oscillator you will need;
1) a meadium resister
2) enough suitable wire to wind 3 equal coils
3) (1 bitt core ) 1 torroidal core and 1 broken torroidal core, that can be glued on to the side of the compleat torroid to make a bitorroidal transformer core with air gaps.
onto the common leg of the bitt core wind the main coil, conect one end the the battery the other end becomes the ac out put on a dc bias.
the second coil is wound on the main torroid, so as to oppose the direction of the magnetic flux from the main coil, when it is conected via the resister to the lead from the battery.
the third (comtrole) coil is wound onto the air gapped leg of the bitt core. it is in series with the second coil and is wound so as to further desaturate the core through the main coil. and conected back to the opposit side of the battery.
electricaly that is;
battery, main coil, the ac outout is between the end of that coil and the battery.
battery, resister, second coil, third coil, battery.
the action
the power is switched on, the flux in the torroidal side of the bitt gose towards saturation. the transformer action between the main coil and coil 2 stops any corrent flowing through the resister, or that circuit.
the core saturates, there is no more transformer action, the curent flows through coils 2 and 3 starting to desaturate the core. increasing the resistance in the main coil.
by transformer action the falling curent in the main coil increases the current in coils 2 and 3, driving the core towards saturation in the revers direction.
the core saturates and the dc curent from the battery through the main coil becomes dominant and the cycle repeats.
this might be useful for thing like electric car in hot climbets.
Your link is to a \'mirrored\' SED thread that\'s 7 years ols.
Your description is of magnetic material and copper wire
that does NOTHING, given the manual power switch as its
only active element.
RL
J
john
Guest
doing a bit more reading i came across an old papper by the us navy that includes a free running multivibrator. that is a square (ish) wave oscillator.
going back to my suggested design above just to say it is based on the joule thief.
the main coil and coil 2, are wound as for the joule thief and serve the same function.
controle coil 3 and the main coil do the switching / take the place of the transister.
from my reading i would suggest having more turns on coil 2, backed up with a diode to ensure that the current only flows in the right direction.
--
For full context, visit https://www.electrondepot.com/electrodesign/magamp-oscillator-783971-.htm
going back to my suggested design above just to say it is based on the joule thief.
the main coil and coil 2, are wound as for the joule thief and serve the same function.
controle coil 3 and the main coil do the switching / take the place of the transister.
from my reading i would suggest having more turns on coil 2, backed up with a diode to ensure that the current only flows in the right direction.
--
For full context, visit https://www.electrondepot.com/electrodesign/magamp-oscillator-783971-.htm