user TURBO?s replication of Steven Mark?s TPU ?

[CTG Labs]

555 will do up to 2MHZ in astable operation!

[MeggerMan]

Summary of chips discussed


Timers:
TS555, top speed 2Mhz, power 110uA @ 5V, square wave only, vary frequency but not duty at the same time. (possible to use an op amp in conjunction to get a duty cycle), price 0.35 GBP.

Waveform:
ICL8038, top speed 300KHz, power 12-20mA @ 10V, sine,triangle,square waves, duty 2% to 98%, no longer recommended for new designs, price 5.90 GBP.

XR2206, 0.01Hz to 1MHz, power 12-17mA, sine,triangle, square waves, duty 1% to 99%, price 2.50 GBP.

PWM:
UC28025, unknown to 1MHz, power 25mA @ 8V, square wave only(push pull output), duty 0 to 45%, price 1.40 GBP

UC28023, as above but push output and duty 0 to 90% (cannot find a supplier).

Phase Locked Loop:(see diagram in previous post)
MC14046B, unknown to 1.6Mhz, power 5uA, square wave only, duty looks fixed at 50%, price 0.34 GBP.

MOSFET drivers:
TPS2812, 25ns rise/fall time, 40ns propagation delay,power 5uA, 2A peak drive current, 4v to 40V supply range, price 0.80 GBP.

Darlington Array:
ULN2003, Darlington array,50V   output, 7 inputs/outputs, 500mA each(600mA pulsed) 25uS on/off delay, price 0.48 GBP.

MOSFETs:
2SK3270-01,Fuji, 6.5mR, 80A, 60V, 335ns rise+fall time, price 3.65 GBP.
IRFU3707, IR, 10mR,56A,30V, 14ns rise+fall time, price 0.70 GBP.
BUZ11, Fairchild, 40mR, 30A, 50V, 200ns rise+fall time (no longer manufactured)

Regards

Rob

[EMuntinga]

hello

replace the cd4046 for a 74hc4046
this one is running up to 17MHZ square wave

ernst

[otto]

Hello all,

Rob,
in your post is everything OK but I dont like the MOSFETs!!!
Look at the Drain voltages:
2SK3270 = 60V
IRFU3707 = 30V!!
BUZ 11 = 50V

Im using the drain (collector) of the MOSFETs to pulse my coils. With the totally wrong frequencies I had 170V without a load measured with a scope. To be short we MUST use MOSFETs that can handle over 300V on the drain (collectors).

Otto

[CTG Labs]

Hi all,

If you think about it, Marco used a 100 pack CD stack spindle to wind the coils.  The spindle is not wide enough to fit those batterys in by a long shot.

And how does this explain one wire?


D.