Live-line Detector

Live-line Detector

Detects the presence of a live mains conductor

Parts:

C1____________100nF 63V Polyester or Ceramic Capacitor D1_____________Red LED (any type) IC1____________4017 Decade counter with 10 decoded outputs IC P1_____________SPST Pushbutton B1_____________3V Battery (two 1.5V AA or AAA cells in series etc.) Sensing probe__3 to 15 cm. long, stiff insulated piece of wire

Diagram:

 

Circuit operation:

If the unit is brought close to a live conductor (insulated, and even buried in plaster) capacitive coupling between the live conductor and the probe clocks the counter, and causes the LED to flash 5 times per second, because the 4017 IC divides the mains 50Hz frequency by 10. When remote from a live line, the unit stops counting, the LED resulting permanently off.

Notes:

• Sensitivity can be varied using a more or less long sensing probe.
• Due to 3V operation, the LED's current limiting resistor can be omitted.

ATA 50 to 40 pin CD-ROM pinout

ATA 50 to 40 pin (notebook CD-ROM) pinout

This adapter will enable you to connect a 50 pin CD-ROM data cable to 40 pin ATA bus.

ATA (40) Pin	CD-ROM (50) Pin	Name	Description
	1	Audio Left	audio left
	2	Audio Right	audio right
	3	Audio ground	audio ground
2	4	GND	Ground
1	5	/RESET	Reset
4	6	DD8	Data 8
3	7	DD7	Data 7
6	8	DD9	Data 9
5	9	DD6	Data 6
8	10	DD10	Data 10
7	11	DD5	Data 5
10	12	DD11	Data 11
9	13	DD4	Data 4
12	14	DD12	Data 12
11	15	DD3	Data 3
14	16	DD13	Data 13
13	17	DD2	Data 2
16	18	DD14	Data 14
15	19	DD1	Data 1
18	20	DD15	Data 15
17	21	DD0	Data 0
21	22	DMARQ	DMA Request
19	23	GND	Ground
25	24	/DIOR	Read Strobe
23	25	/DIOW	Write Strobe
22	26	GND	Ground
27	27	IORDY	I/O Ready
29	28	/DMACK	DMA Acknowledge
31	29	INTRQ	Interrupt Request
32	30	/IOCS16	IO ChipSelect 16
33	31	DA1	Address 1
34	32	PDIAG	Passed Diagnostics
35	33	DA0	Address 0
36	34	DA2	Address 2
37	35	/IDE_CS0	(1F0-1F7)
38	36	/IDE_CS1	(3F6-3F7)
39	37	/ACTIVE - /DASI - DASP	Led driver
+5V	38	+5V	+ 5 volts power
+5V	39	+5V	+ 5 volts power
+5V	40	+5V	+ 5 volts power
+5V	41	+5V	+ 5 volts power
+5V	42	+5V	+ 5 volts power
24	43	GND	Ground
26	44	GND	Ground
30	45	GND	Ground
40	46	GND	Ground
28	47	Device Cfg	Spindle Sync or Cable Select
GROUND	48	GND	Ground
	49	reserved	Vendor Unique
	50	reserved	Vendor Unique

Lie Detector

Here's a simple lie detector that can be built in a few minutes, but can be incredibly useful when you want to know if someone is really telling you the truth. It is not as sophisticated as the ones the professionals use, but it works. It works by measuring skin resistance, which goes down when you lie. 

Parts 

Part                             Total                         Qty.                 

ResistorR1                    1                             33K 1/4W 

Resistor R2                   1                             5K Pot 

Resistor R3                   1                             1.5K 1/4W 

Capacitor C1                 1                             1uF 16V Electrolytic Capacitor 

Transistor Q1                1                            2N3565 NPN Transistor 

Analog Meter M1         1                             0-1 mA 

Case

Wire

Electrodes  

Notes

1. The electrodes can be alligator clips (although they can be painful), electrode pads (like the type they use in the hospital), or just wires and tape. 

2. To use the circuit, attach the electrodes to the back of the subjects hand, about 1 inch apart. Then, adjust the meter for a reading of 0. Ask the questions. You know the subject is lying when the meter changes.