Search found 1253 matches

by Dean Huster
Fri Dec 28, 2001 4:32 pm
Forum: General Discussion
Topic: Temperature comparison, differential
Replies: 3
Views: 2293

Re: Temperature comparison, differential

Thomas, I designed a similar circuit and published it in the May 2001 edition of "Q & A" in Poptronics magazine. I've posted the schematic at http://167.206.219.243/forums/electronic_bench/posts/524.html <p>This is a thermistor-based circuit designed to turn a ceiling fan on if the temperature diffe...
by Dean Huster
Fri Dec 28, 2001 11:56 am
Forum: General Discussion
Topic: serial-to-tape? using basicx-24
Replies: 4
Views: 2312

Re: serial-to-tape? using basicx-24

Try some Internet research of the old "Kansas City Standard", a popular method of storing data on standard audio cassettes during the heyday of Altair, IMSAI, Processor Technology, etc. of the mid-1970's. Seems to me that there were some construction articles in the early days of Byte magazine (befo...
by Dean Huster
Tue Dec 18, 2001 9:50 am
Forum: General Discussion
Topic: parabolic microphone
Replies: 4
Views: 2497

Re: parabolic microphone

There were two from the 1960's as I recall. Electronics Illustrated had one using a "parabolic" reflector which was actually a stainless steel mixing bowl. Popular Electronics had "The Shotgun Sound Snooper" which used resonant tubes formed into a rifle-mic, said to have better performance than the ...
by Dean Huster
Thu Dec 13, 2001 8:47 am
Forum: General Discussion
Topic: Volt to Freq
Replies: 3
Views: 3093

Re: Volt to Freq

I'm just curious. What's the application that requires that kind of open-loop precision?
by Dean Huster
Thu Dec 13, 2001 8:42 am
Forum: General Discussion
Topic: Question about a Headlight modulator schematic
Replies: 11
Views: 8442

Re: Question about a Headlight modulator schematic

The fact that the cap is ceramic or Z5U shouldn't affect things other than frequency. The Z5U ceramic isn't a leaky cap compared to polyester ... it just has a nasty tempco. And the danged thing changes capacitance value depending upon the dc voltage applied.<p>Dean
by Dean Huster
Wed Dec 12, 2001 5:58 am
Forum: General Discussion
Topic: welcome
Replies: 9
Views: 6579

Re: welcome

I wouldn't concern myself with a 3-phase design for a residence anyway. Most power companies will only drop 3-phase service to industrial concerns, irrigation pumps, oil wells or large buildings that can justify the expense of their installing three transformers. And if there isn't a 3-phase line al...
by Dean Huster
Wed Dec 12, 2001 5:52 am
Forum: General Discussion
Topic: Question about a Headlight modulator schematic
Replies: 11
Views: 8442

Re: Question about a Headlight modulator schematic

I hate to sound ignorant, but exactly what does a "headlight modulator" do? My first impressions are that it's illegal to use in a private vehicle as most state make flashing white lights on the front of a vehicle legal only for fire, police, EMT and coronors' vehicles .... even volunteer firefolk c...
by Dean Huster
Wed Dec 05, 2001 10:04 am
Forum: General Discussion
Topic: DELETED
Replies: 6
Views: 5025

Re: Welcome Back

Good to see you guys back on-line, Greg! It's a lot of work, but we folks out here really do appreciate all that goes into developing and maintaining a forum like this. Go open a Diet Coke. You deserve a break!<p>On the edit: Oooooh! Member #12. Does that mean that I just barely made the "Dirty Doze...