- Kutztown XXXIX - 4 Updates
- Activate PIR xmtr - 6 Updates
| "pfjw@aol.com" <peterwieck33@gmail.com>: Sep 24 04:01AM -0700 > Vintage 'boom boxes'? There were, perhaps, 15+ boom boxes that I saw more-or-less equally distributed through both pavilions, from a very nice looking, quite large Grundig to a "Sonic" approximately the size of a modern aircraft carrier. Peter Wieck Melrose Park, PA |
| Fox's Mercantile <jdangus@att.net>: Sep 24 06:31AM -0500 > There were, perhaps, 15+ boom boxes that I saw And how many of the "antique" radios in comparison? -- "I am a river to my people." Jeff-1.0 WA6FWi http:foxsmercantile.com |
| "pfjw@aol.com" <peterwieck33@gmail.com>: Sep 24 05:31AM -0700 On Monday, September 24, 2018 at 7:35:15 AM UTC-4, Fox's Mercantile wrote: > And how many of the "antique" radios in comparison? At least thousands - and as we are now in 2018, some few of the homebrew battery sets are at the magic 100-year mark this year, with some of the commercially produced radios reaching that mark next year. There were two coherers on offer, thy also make that grade. But, on the range between, say.... 1919 and 1963, at least thousands. Lewie had over 60 radios on his table alone, and he was one of roughly 200 dealers in all. I write 'roughly' as some dealers share tables - the guy who sells reproduction dial covers shares with the guy that produces (yes, produces) reproduction grille cloth, radio pointers (including Zenith Zs) and fasteners (those little brass flower-head nails and screws). As one of several examples. For those who have been there, the show covered 4/5ths of the second pavilion, and that pavilion is now entirely sold out for the spring show. Despite the marginal weather (damp and cool, but no activities cancelled or shortened), things were very busy right up until closing - about 2:00 pm Saturday. Note: One seller even had a stock of various-sized D-springs for wooden friction-fit knobs. Go figure. Peter Wieck Melrose Park, PA |
| "pfjw@aol.com" <peterwieck33@gmail.com>: Sep 24 09:40AM -0700 https://john-h.smugmug.com/Kutztown-XXXIX-Video-Slideshow/i-Tk6zmR7/A Peter Wieck Melrose Park, PA |
| OGER <OGER@NOWHERE.COM>: Sep 23 12:11PM -0700 Suggestions please. Taking a driveway PIR xmtr to modify for other purposes with no actual internal mods. Thinking of using some emitter taped to the PIR window to activate the xmtr. Something as simple as a blinking LED to keep the xmtr transmitting while the LED is blinking. Using one of these. 4VWIN Wireless Home Security Driveway Alarm https://www.amazon.com/4VWIN-Wireless-Security-Driveway-Receiver/dp/B01JRASCDU/ref=sr_1_129?ie=UTF8&qid=1537407005&sr=8-129&keywords=garage+door+monitor or Harbor Freight Home Security Driveway Alarm https://www.harborfreight.com/wireless-security-alert-system-62447.html Suggestions please. Switch State Open - LED off and no PIR activation Closed - LED blinks to maintain PIR activation. Option 1: blinking LED and switch and battery. Option 2: 555 timer, LED, switch and battery. Or ??? What is needed to activate the PIR. LED color or type ? Receiver will just be the reeiver's flashing LED with the audio function disabled. I think it is a transducer that I can either smother or cut out of the circuit if it is not part of the receiver function. What do you think? |
| Jasen Betts <jasen@xnet.co.nz>: Sep 23 09:22PM > Taking a driveway PIR xmtr to modify for other purposes with no actual > internal mods. > What is needed to activate the PIR. LED color or type ? changing thermal infrared small 100 ohm resistor fed by 1Hz 5V square wave -- ت |
| John Larkin <jjlarkin@highlandtechnology.com>: Sep 23 02:34PM -0700 On Sun, 23 Sep 2018 12:11:16 -0700, OGER <OGER@NOWHERE.COM> wrote: Active Passive? PIRs don't transmit. -- John Larkin Highland Technology, Inc lunatic fringe electronics |
| OGER <OGER@freenut.com>: Sep 23 06:07PM -0700 When looking for the LED, what description do I look for ? I have never seen anything called a thermal LED. DigiKey have them. Their on-line catalog is impossible to find anything especially LEDs. Any part number for me ? I am trying to build a garage door monitor. My new garage door opener does not have a lock function like my previous so I need a way to monitor the door state in my house, The driveway monitor is almost all I need and if I had a schematic I could modify it internally. Looking at the circuit board does not give enough info. Jasen Betts wrote: > changing thermal infrared > small 100 ohm resistor fed by 1Hz 5V square wave Jasen Betts wrote: |
| Rheilly Phoull <rheilly@bigslong.com>: Sep 24 10:15AM +0800 On 24/09/2018 9:07 AM, OGER wrote: > The driveway monitor is almost all I need and if I had a schematic I > could modify it internally. Looking at the circuit board does not give > enough info. You could pick off a signal from the down limit switch to drive a transmitter or direct wire to a led inside the home or whatever. |
| Jasen Betts <jasen@xnet.co.nz>: Sep 24 07:35AM > When looking for the LED, what description do I look for ? > I have never seen anything called a thermal LED. you need a heat emitter, not a light emitter, use a small heat source, like a small lamp or a resistor an LM555 powered by 5V blinking a 0.3W 6V lamp would probably do the trick digikey part number CM756-ND is a 14V lamp but using lower voltage will make it last longer and produce more infrared than a 5V lamp Wire the 555 discharge and output pins in parallel, this lamp is borderline max load for a 555 so combining the two outputs will help.. ----+-----------------+-- +5V 1Meg | | +-[R1]--------|--------+--(@)---+ | | | | +--------+ | lamp | | | | | | . . . .|. . . . | | | . VCC(8) . | | | . . | | +--RES(4) OUT(3)--+ | . LM555 . | +-------TH(6) DIS(7)--+ | . . +-------TR(2) CV(5)-----+ 1uF | . . | ===== . GND(1) . | | . . . .|. . . . ===== 100nf | | | +-------------+ | | | +-----------+ | ---+-- 0V run frequency is about 1.4Hz -- Bye. Jasen -- ت |
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