Control 120VAC relay with TTL From: grege@... (Greg Ebert) An opto-triac is the easiest way. Digi-Key sells them for 1-2 bucks apiece. The...
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Nicolae Sfetcu
nsfetcu@...
May 4, 2001 8:42 pm
Info on CO2 lasers From: wouter@... (Wouter Slegers) I'd like to get some info CO2-lasers... I read the following on a BBS.. If anyone has a...
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Nicolae Sfetcu
nsfetcu@...
May 7, 2001 4:09 pm
What do all the wire colors mean? Two wires (normally referred to as a "pair") are needed for most telephone connections. One of the wires in a pair is...
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Nicolae Sfetcu
nsfetcu@...
May 9, 2001 4:44 pm
LED Display controller From: byron@... (Byron A Jeff) " I would like to make a big LED scrolling display (like the ones you find in a bank), about 10...
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Nicolae Sfetcu
nsfetcu@...
May 12, 2001 12:07 pm
Simple telephone test circuit Copyright Tomi Engdahl 1997 I have used this type of circuits for quick testing of telephone equipment. This is a quick hack that...
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Nicolae Sfetcu
nsfetcu@...
May 14, 2001 5:43 pm
Quiz-Show Indicator From: dthomas@... (Dave Thomas) "Name something you eat with eggs." -<bzzzzt!>-"Fiberglass." Here's a simple, cheap circuit that...
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Nicolae Sfetcu
nsfetcu@...
May 16, 2001 7:39 pm
SCHEMATICS FOR DAU-9P (MBUS) There is two versions, version to work with I.C. MAX3232, that it's not easy to find and version with MAX232. Both versions works...
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Nicolae Sfetcu
nsfetcu@...
May 18, 2001 7:41 pm
Driving a relay with a CPU (From Kip J. Mussatt) Try using a simple transistor like a 2N4124 just feed the base from the emitter of the opto-isolator. Don't...
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Nicolae Sfetcu
nsfetcu@...
May 22, 2001 4:05 pm
HV supply: 12VDC in, 12KV out (From Sam Goldwasser) Simple High Voltage Generator - 12 V in, 12,000 V out inverter. Modify appropriately for 24 V in, 30,000+...
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Nicolae Sfetcu
nsfetcu@...
May 23, 2001 5:08 pm
'Rounding Off' a square wave From: CXW14@... Christopher Webster To "round" your square wave, you need to integrate it twice; once to produce a...
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Nicolae Sfetcu
nsfetcu@...
May 24, 2001 11:24 pm
'Nixie' display tubes From: mkuhn@... (Martin W Kuhn) Nixies are lots of fun. I just recently built a digital clock out of Nixies, so I think I...
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Nicolae Sfetcu
nsfetcu@...
May 25, 2001 10:09 pm
Headlight Reminder Circuit From: ps10@... (Paul Simmonds) A [...] solution is to go from the +12 Switched sidelight feed, via a buzzer to the drivers door...
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Nicolae Sfetcu
nsfetcu@...
May 27, 2001 7:28 pm
( http://www.uoguelph.ca/~antoon/circ/circuits.htm ) Bench-test your circuit first and apply power to the circuit, with the brakelight connected, for at least...
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Nicolae Sfetcu
nsfetcu@...
May 28, 2001 6:21 pm
Telephone Recorder ... This nifty little circuit lets you record your phone conversations automatically. The device connects to the phone line, your tape...
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Nicolae Sfetcu
nsfetcu@...
May 29, 2001 8:57 pm
Frequency and Capacitance meter From: kenny@... An [...] idea is to use the 555 as a monostable, and trigger it with a fixed frequency clock. Duty...
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Nicolae Sfetcu
nsfetcu@...
May 30, 2001 4:41 pm
40W Fluorescent Lamp Inverter This 40W fluorescent lamp inverter allows you to run 40W fluorescent tubes from any 12V source capable of delivering 3A. This is...
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Nicolae Sfetcu
nsfetcu@...
May 31, 2001 8:10 pm
555 Timer Tutorial by Tony van Roon ... The 555 timer IC was first introduced arround 1971 by the Signetics Corporation as the SE555/NE555 and was called "The...
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Nicolae Sfetcu
nsfetcu@...
Jun 1, 2001 9:17 pm
Definition of Pin Functions: Refer to the internal 555 schematic of Fig. 4-2 Pin 1 (Ground): The ground (or common) pin is the most-negative supply potential...
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Nicolae Sfetcu
nsfetcu@...
Jun 4, 2001 8:40 pm
Monostable Mode: The 555 in fig. 9a is shown here in it's utmost basic mode of operation; as a triggered monostable. One immediate observation is the extreme...
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Nicolae Sfetcu
nsfetcu@...
Jun 5, 2001 4:45 pm
Applications: There are literally thousands of different ways that the 555 can be used in electronic circuits. In almost every case, however, the basic circuit...
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Nicolae Sfetcu
nsfetcu@...
Jun 6, 2001 5:01 pm
Example Circuits: I have placed a couple of 555 circuit examples below for your convenience. Play with different component values and use the formulas...
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Nicolae Sfetcu
nsfetcu@...
Jun 7, 2001 7:36 pm
The following circuits are examples of how a 555 timer IC assist in combination with another Integrated Circuit. Again, don't be afraid to experiment. Unless...
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Nicolae Sfetcu
nsfetcu@...
Jun 8, 2001 11:34 pm
Parts List R1 = 68K, 5% R2 = 39K, 5% C1 = 1uF, 16V C2 = 10nF (0.01uF) ceramic Two red led's 8-pin dip socket On-off switch or push-on switch 1 - The ON-OFF...
165
Nicolae Sfetcu
nsfetcu@...
Jun 11, 2001 4:19 pm
Black Light ... This circuit is a simple ultraviolate light that can be powered by a 6 volt battery or power that is capable of supplying 1 or more amps. ...
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Nicolae Sfetcu
nsfetcu@...
Jun 12, 2001 8:09 pm
Table 1 Part Description Radio Shack Digi Key Notes IC1 LM555 timer/oscillator 276-1723 NE555, etc. T1 2N3906 transistor NPN, 50V150mA ...
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Nicolae Sfetcu
nsfetcu@...
Jun 13, 2001 3:56 pm
Joysticks and other game controllers By Tomi Engdal 1996-1998 DISCLAIMER: This information and the circuits are provided as is without any express or implied...
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Nicolae Sfetcu
nsfetcu@...
Jun 14, 2001 11:33 pm
o - Excellent clock generator to drive 4017 type cmos circuits. o - R1 = 10K to 10M, C1 = 100pF to 47uF. o - Fo is ±1Kz when R1=100K and C1=10nF. o - Input...
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Nicolae Sfetcu
nsfetcu@...
Jun 15, 2001 3:45 pm
Colour (Sound) Organ ... Anyone who has been to a night club, concert or school dance has probobly seen a colour organ. Colour organs cause lights to blink and...
170
Nicolae Sfetcu
nsfetcu@...
Jun 18, 2001 4:43 pm
What Exactly Is An Op-Amp? What exactly is an OPerational AMPlifier? Let's define what that component is and look at the parameters of this amazing device. The...
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Nicolae Sfetcu
nsfetcu@...
Jun 19, 2001 7:13 pm
Summed-up Features: a.. Internal Frequency Compensation a.. Short Circuit Protection a.. Offset voltage null capability a.. Excellent temperature stability a.....
