Thanks for the info. I've been searching for a 33v mov, but there doesn't seem to be any. Here's one that is close, a 30vac mov. Open circuit voltage on the transformer is 26 vac.
V47ZA3
Max applied voltage: 30 V Acrms, 38 V DC
Max energy, 2ms: 4.5 J
Clamping voltage: 93 V...
I can't put it on the AC side of the transformer, because it is in the attic somewhere. Exactly where, I'm not sure. Anyway, I read somewhere that protection components are best placed on the board, right where the power enters. The idea is that inductive surges from lightning, etc. are also...
I had a recent power failure that blew out routers, hard wired smoke detectors, etc. The most painful was a pic-based motor controller that runs off of 24vac.
Now that I've replaced everything, I would like to protect the motor controller. From what I've read, I could use opposing Zeners on...
You're right, the datasheets for NTE semiconductors aren't like others I've seen. Anyway, I found out that NTE2343 cross references to TIP102. Luckily, fairchild has plots for the tip102. I hope that has the necessary info ;D
http://www.fairchildsemi.com/ds/TI/TIP102.pdf
indulis: I'm a newbie. Newbie + static sensitive parts = poof ;)
audioguru: I could not get a tip120, I ended up with an NTE2343. Also a darlington npn, supposed to similar and handles more power.
http://www.nteinc.com/specs/2300to2399/NTE2343.html
Any difference in the calcs? Is there...
Thanks the info, audioguru.
I plan on using a readily available led, which means Radio Shack :o
http://www.radioshack.com/product/index.jsp?productId=2062553
This led does need a current limiting resistor. It is Vf 2.25, 90mA. If the darlington turns on at 1mA, will 50mA thru the base...
Hi,
I need to blink an array of 78 white leds. I figure that I need to switch about 4.0 volts at 1.6 amps.
I want to take a $1.00 blinky led as a signal source and drive a TIP120 with it. When using a TIP120 as a switch, can I just wire it in series with the LED array ground connection? ...