Low Freq. Capacitor Charger
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From: John Nagle on 25 May 2010 00:42 Oppie wrote: > Sounds like we are being asked to assist with a homework (or extra > credit) problem... > Typical student type (or Physicist) with little understanding of > practical electronics. I get that feeling too. It's straightforward to build or get a photoflash-type switching power supply, but the "10 Hz" business just gets in the way. Normally, one does step-up applications like this at a few KHz, using a tiny transformer. John Nagle
From: Greegor on 25 May 2010 07:02 10 Hz at 100 V like a ring on a phone line?
From: Uwe Hercksen on 25 May 2010 10:05 Jeff Niles schrieb: > I am thinking of an LM555 feeding a 10% duty cycle pulse to an 8R:1K > miniature audio transformer, or two of the latter with output sides > wired in series to increase voltage. The cap would be connected across > this, and isolated from the charging circuit with a switch after > charging. Hello, you should do the necessary math before. Calculate the needed current to drive a 100 �F capacitor to a voltage of 240 V 10 Hz sinus and calculate the necessary primary current to the transformer to get the secondary current to the capacitor. 10 % duty cycle requires even more current. Bye
From: Uwe Hercksen on 25 May 2010 10:08 John Nagle schrieb: > I get that feeling too. It's straightforward to build or get > a photoflash-type switching power supply, but the "10 Hz" business > just gets in the way. Normally, one does step-up applications > like this at a few KHz, using a tiny transformer. Hello, a minatur audio transformer is not useful with 10 Hz anyway. Bye
From: David Eather on 25 May 2010 10:10
On 26/05/2010 12:08 AM, Uwe Hercksen wrote: > > > John Nagle schrieb: > >> I get that feeling too. It's straightforward to build or get >> a photoflash-type switching power supply, but the "10 Hz" business >> just gets in the way. Normally, one does step-up applications >> like this at a few KHz, using a tiny transformer. > > Hello, > > a minatur audio transformer is not useful with 10 Hz anyway. > > Bye > They work fine with short pulses repeating at 10Hz |