Friday, March 29, 2013
Rj61 Wiring Color Code Pinout Diagramcircuit Schematic
Ethernet Stp Outdoor Ethernet Cable 1000ft Cat5e 568b Wiring.
Infrastructure Wiring Block Diagram Show Ing.
Howstuffworks How Ethernet Works.
Rm4200d Ethernet Wiring Example3.
The Compass Derose Guide To Ethernet Computer Network Wiring.
How To Guide Creating Cat 5 Utp Ethernet Crossover Cable How To.
How To Make A Rj45 Cable Tester.
Rj61 Wiring Color Code And Pinout Diagram Circuit Schematic.
Ethernet Cables By Karl Shoemaker Ak2o.
Terminating Wall Plates Structured Home Wiring.
Thursday, March 28, 2013
Simple RF Detector For 2M
This simple circuit helps you sniff out RF radiation leaking from your transmitter, improper joints, a broken cable or equipment with poor RF shielding. The tester is designed for the 2-m amateur radio band (144-146 MHz in Europe). The instrument has a 4-step LED readout and an audible alarm for high radiation voltages. The RF signal is picked up by an antenna and made to resonate by C1-L1. After rectifying by diode D1, the signal is fed to a two-transistor high-gain Darlington amplifier, T2-T3.
Assuming that a 10-inch telescopic antenna is used, the RF level scale set up for the LEDs is as follows: When all LEDs light, the (optional) UM66 sound/melody generator chip (IC1) is also actuated and supplies an audible alarm. By changing the values of zener diodes D2, D4, D6 and D8, the step size and span of the instrument may be changed as required. For operation in other ham or PMR bands, simply change the resonant network C1-L1. As an example, a 5-watt handheld transceiver fitted with a half-wave telescopic antenna (G=3.5dBd), will produce an ERP (effective radiated power) of almost 10 watts and an e.m.f. of more than 8 volts close to your head.
Inductor L1 consists of 2.5 turns of 20SWG (approx. 1mm dia) enameled copper wire. The inside diameter is about 7mm and no core is used. The associated trimmer capacitor C1 is tuned for the highest number of LEDs to light at a relatively low fieldstrength put up by a 2-m transceiver transmitting at 145 MHz. The tester is powered by a 9-V battery and draws about 15mA when all LEDs are on. It should be enclosed in a metal case.
[Continue reading]
Assuming that a 10-inch telescopic antenna is used, the RF level scale set up for the LEDs is as follows: When all LEDs light, the (optional) UM66 sound/melody generator chip (IC1) is also actuated and supplies an audible alarm. By changing the values of zener diodes D2, D4, D6 and D8, the step size and span of the instrument may be changed as required. For operation in other ham or PMR bands, simply change the resonant network C1-L1. As an example, a 5-watt handheld transceiver fitted with a half-wave telescopic antenna (G=3.5dBd), will produce an ERP (effective radiated power) of almost 10 watts and an e.m.f. of more than 8 volts close to your head.
Inductor L1 consists of 2.5 turns of 20SWG (approx. 1mm dia) enameled copper wire. The inside diameter is about 7mm and no core is used. The associated trimmer capacitor C1 is tuned for the highest number of LEDs to light at a relatively low fieldstrength put up by a 2-m transceiver transmitting at 145 MHz. The tester is powered by a 9-V battery and draws about 15mA when all LEDs are on. It should be enclosed in a metal case.
Thermostat Delay Relay Timer Circuit
The circuit given below describes a time delay relay system which is used for keeping a hot air blower working under a specifically programmed timing sequence. The idea was requested by Mr. Doug Shadix, lets learn more:
Hi Swagatam,
Looks like you know your stuff when it comes to these timer circuits, this one is a little out there but dont believe it is out of your knowledge.
This is a replacement part for an old Bryant furnace 822 relay. What is needed is a circuit that will get a 24VAC supply when the thermostat kicks in, it will have to have a 45 second delay before triggering a relay that powers the 1/3HP blower motor, the motor needs to run for 45 seconds after the voltage is shut off via the thermostat. Im sure that there is a more efficient circuit other than the 822 relay to do the job, especially when you take cost into the equation.
Once the thermostat kicks in it sends 24VAC thru the limit switch(as long as its not tripped from an overheat), then thru the pilot lights thermo coupler (providing that the pilot is lit)then applies it to the timer/relay. Once the thermostat kicks out the voltage goes to zero across all components.
Yes, the process would have to repeat each time the thermostat kicks the furnace on.
I was orginaly looking at the 556 timer chip to see if it would be able to serve the dual delay, but looking to you for the best way to get it done.
The Design:
The circuit shown below will respond exactly as per the requested specs. The entire functioning can be understood with the the following points:
When the thermostat "kicks in", the 24V AC is applied across D1 and ground of the circuit. The 24VAC gets rectified through D1/C1 and passes through R2 to reach the junction of R3 and D3.
Since initially C2 is in a discharged state the supply gets grounded via D3 and C2.
However as C2 starts charging up, after a predetermined time (45 seconds) set by the values of R2/C2, the voltage across C2 reaches about 1.4V which becomes sufficient to trigger T1.
T1 conducts and so does T2, pulling the relay into action.
The blower connected to the relay contacts initiates.
After some specified time the thermostat switches OFF.
When this happens, the voltage at the cathode of D1 becomes zero which makes D2 forward biased. such that The instantaneous voltage at the collector of T2 instantly passes via C3, D2 and retains the conduction of T1.
The above situation inhibits the circuit and the relay from switching OFF even after the thermostat has switched OFF.
However now C3 start charging up, and after some predetermined time (45 seconds) set by the value of C3/R6, it gets fully charged and shuts off the base bias to T1.....the circuit and the relay also shut off....until the thermostat "kicks back" again to repeat the procedure.
Parts List for the proposed timer delay/relay circuit idea
R1 = 100K
R2 = may be replaced with a 1M preset
R3,R4,R5 = 10K
R6 = may be replaced by a 100K preset
D1----D5 = 1N4007
C1,C2 = 100uF/50V
C3 = 220uF/25V
T1 = BC547
T2 = as per the relay coil current
Under Voltage Lockout for Buck Circuit Using LM2575
This is a implementation for buck boost configuration. This circuit is control by LM2575. This is the figure of the circuit.
In some applications it is desirable to keep the regulator off until the input voltage reaches a certain threshold. These circuits keep the regulator off until the input voltage reaches a predetermined level.
VTH ≈ VZ1 + 2VBE (Q1)
In some applications it is desirable to keep the regulator off until the input voltage reaches a certain threshold. These circuits keep the regulator off until the input voltage reaches a predetermined level.
VTH ≈ VZ1 + 2VBE (Q1)
1999 Chevrolet Chevy 1500 Pu V6 Wiring Diagram
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| 1999 Chevrolet Chevy 1500 Pu V6 Wiring Diagram |
The Part of 1999 chevrolet Chevy 1500 Pu V6 Wiring Diagram:power distribution coil, A/C compressor fuse, ignition fuse, underhood bussed electrical center, high pressure cutout switch, A/C compressor clutch, A/C low pressure cycling switch, ground distribution, powertrain control module, vehicle control module, A/C automatic recirculating switch, HVAC control module.
Wednesday, March 27, 2013
Kapanadze Free Energy Generator Schematics
Kapanadze Free Energy Generator Schematics
555 Equivalent Circuit
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