Hot transitors @ 0.5 Amps - Page 2 - Electronic Circuits Projects Diagrams Free

Roff · 13th October 2005, 07:59 PM

Quote:

Originally Posted by danielsmusic

here is the regulator i built

What's the deal with D7? C1 won't do its job with a diode in series with it.

audioguru · 14th October 2005, 01:38 AM

Daniels,
In addition to D7:
1) Why use a transformer with a high voltage of 24V when the 7812 needs only 15VDC? 24VAC makes 32VDC when rectified and filtered.
2) Why is the value of C1 and C2 so high? Only 0.1uF is usually used but some people use as high as 10uF.
3) Aren't the LEDs very dim with such high values for their current limiting resistors? I figure red LEDs will get only about 1mA.

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14th October 2005, 01:38 AM	(permalink)
audioguru	Daniels, In addition to D7: 1) Why use a transformer with a high voltage of 24V when the 7812 needs only 15VDC? 24VAC makes 32VDC when rectified and filtered. 2) Why is the value of C1 and C2 so high? Only 0.1uF is usually used but some people use as high as 10uF. 3) Aren't the LEDs very dim with such high values for their current limiting resistors? I figure red LEDs will get only about 1mA. __________________ Uncle $crooge