Search found 546 matches

by jimandy
Thu Jan 06, 2005 5:59 am
Forum: General Discussion
Topic: Voltage follower with variable offset?
Replies: 13
Views: 3382

Re: Voltage follower with variable offset?

What if you invert the 0-10v input, clip the resulting 10 - 0 v with a diode, then re-invert that? - This makes so much sense to me that I know there must be a hole in it wide enough for flaming arrows.
by jimandy
Tue Jan 04, 2005 6:48 pm
Forum: General Discussion
Topic: amperage or current
Replies: 24
Views: 5718

Re: amperage or current

For my money - H & H plus a set of Don Lancaster's "CookBooks" can suffice for most eveything. Even makes for good bathroom reading.
And as for shorts, isn't it fun to hear the cable man tell you there's a "shortage" somewhere down the line.
by jimandy
Mon Jan 03, 2005 7:41 pm
Forum: General Discussion
Topic: 1N111 germanium diode
Replies: 4
Views: 1452

Re: 1N111 germanium diode

If a germanium is required it's probably because of it's lower forward voltage drop. Most most small signal germaniums will interchange, i,e, a 1n34a for a 1n111. Try a NTE109 from Mouser which subs for a bunch of 'em.
by jimandy
Wed Dec 29, 2004 5:44 pm
Forum: General Discussion
Topic: Automatically switching 2 audio signals based on input l
Replies: 9
Views: 3934

Re: Automatically switching 2 audio signals based on input l

I've built an audio detector to logic level circuit along your rectifier idea. All that was needed was a diode, a .1 mfd cap and a resistor in a simple half wave rectifier config . The resistor was a pot to adjust sensitivity. The trick is to follow it with a schmitt (sp?) trigger - one stage of a 7...
by jimandy
Tue Dec 28, 2004 4:05 pm
Forum: General Discussion
Topic: Drilling PC Board
Replies: 12
Views: 2993

Re: Drilling PC Board

My first post. Be gentle!<p>I'll 2nd & 3rd the Dremel solution. I use the two speed unit (on low speed) and Dremel's own drill press gadget. Bought their teeninecy drill bit and have used the same one for at least five boards with ten or more holes and the bit is yet unbroken. All my boards were sin...