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Index 6



READY,SET,GO!

Published:2009/7/1 4:21:00 Author:May

READY,SET,GO!
Circuit NotesThis game tests a player's reaction time.It is activated by closing switch S1, which starts the tone generator and arms the circuit.The touchplate, labeled PLAY in the diagram, consists of two metal strips about 1/16th-inch apart. The first player to bridge the gap with his or her finger turns off the tone and lights the associated LED indicator. A second touchplate, labeled CLR in the diagram, clears the circuit, extinguishing the LED, when its gap is bridged by a fingertip.   (View)

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FUZZ_BOX_2

Published:2009/7/1 4:13:00 Author:May

FUZZ_BOX_2
Circuit Notes Potentiometer R3 sets the degree of fuzz, and R8 sets the output level. Since the fuzz effect cannot be completely eliminated by R3, fuzz-free sound requires a bypass switch from the input to output terminals.   (View)

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FUZZ_BOX_1

Published:2009/7/1 4:11:00 Author:May

FUZZ_BOX_1
Circuit NotesThe input signal is amplified by the transistors. The distorted output is then clipped by the two diodes and the high frequency noise is filtered from the circuit via the 500 pF capacitor. The 1 M pot adjusts the intensity of fuzz frog maximum to no fuzz (normal the playing).   (View)

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ELECTRONIC_ROULETTE

Published:2009/7/1 0:32:00 Author:May

ELECTRONIC_ROULETTE
U1 (a 4046 PLL containing a voltage controlled oscillator or VCO, two phase comparators, a source follower, and a Zener diode) is used to produce a low-frequency, pulsed output of about 40 Hz. The VCO's frequency range is determined by R6 and C2, which can. be altered by varying the voltage at pin 9. The rising voltage causes the frequency to rise from zero to threshold and remain at that frequency as long as 51 is closed. When S1 is opened, C1 discharges slowly through RI to ground and the voltage falls toward zero. That produces a decreasing pulse rate. The output of UI at pin 4 is connected to the clock input of U2 (a 4017 decade decoder/driver) at pin 14 via C3. U2 sequentially advances through each of its ten outputs (0 to 9)-pins 1 to 7, and 9 to 11-with each input pulse. As each output goes high, its associated LED is lighted, and extinguished when it returns to the low state. Only eight outputs are used in the circuit, giving two numbers to the spinner of the house. The circuit can be set up so that the LED's lights sequence or you can use some staggered combination; the LEDs grouped in a straight line or a circle.   (View)

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SWR_T0_500_MHz

Published:2009/6/25 23:47:00 Author:May

SWR_T0_500_MHz
Permits measuring standing-wave ratio well above limits of many inex-pensive indicators. Fot transmitters up to 2 W, coupling loop L1-L2 can be about 1 inch long.For high-power transmitters, loop length can be reduced to about 1/8 inch.-W. E. Parker, UHF SWR Indicator, 73 Magazine, June 1977, p 68-70.   (View)

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PARAPHASE_PHASE_INVERTER

Published:2009/6/24 23:34:00 Author:May

PARAPHASE_PHASE_INVERTER
Uses 180° phase difference between source and drain out-puts of Siliconix Ut83 FET to convert AF input to push-pull output without transformer. Volt-age gain in each half of circuit is about 0.8. Frequency response referred to 1 kHz is flat within 3 dB from 50 Hz to 50 kHz, when using lmeg-ohm output load.-R. P. Turner, FET Circuits, Howard VV. Sams, Indianapolis, IN, 1977, 2nd Ed.,p 29-30.   (View)

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SYNC_STRETCHER_CIRCUIT

Published:2009/6/24 3:27:00 Author:May

SYNC_STRETCHER_CIRCUIT
Q1, Q2, and Q3 comprise a simple video amplifier and sync stretch circuit. Transistor Q1 sync strips the incoming video, which is amplified and mixed with the stripped sync in Q2. Q3 supplies in-version and video amplitude control.   (View)

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Instrument and Signal Circuit Principle Diagram of Liberation CA6400 Series Light Buses

Published:2011/7/22 21:54:00 Author:Michel | Keyword: Liberation, Light Buses, Instrument, Signal, Principle Diagram

Instrument and Signal Circuit Principle Diagram of Liberation CA6400 Series Light Buses
Picture:Instrument and Signal Circuit Principle Diagram of Liberation CA6400 Series Light Buses 29-manual indication lights,30-switch of manual indication lights,31-hydraulic warning lights ,32-hydraulic alarm switch,33-temperature sensor,34-fuel table sensor,35-temperature table,36-fuel table,,37and 38-backup light,39-switch of backup light,40-horn relays,41and 42-horn button,43 and 44- claxon.   (View)

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12V-24V Voltage Conversion Start System Circuit of Toyota Coaster

Published:2011/7/22 21:52:00 Author:Michel | Keyword: Toyota Coaster, Voltage Conversion , Start System Circuit

12V-24V Voltage Conversion Start System Circuit of Toyota Coaster
Fifth,12V-Z4V Voltage Conversion Start System Coaster coach circuit often uses 12 V system or 24 V system. Some models are 12 V system but they adopt 24 V to start the machine.24V starter is used when the 12V diesel engine feels that 12V start power is not enough.If other electrical system such as generator, electrical equipment are still 12 V,two batteries are needed. 1 and 2 are usually in a parallel state,they bear 12 V generator charge or provide power supply for 12 V power equipment system.When it starts up, two batteries voltage conversion relay reach a 24 V in series way and provide power supply to the starter.When starting is over, voltage conversion relay makes two batteries become parallel connetcion way. And the circuit connection is shown as figure 7.   (View)

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SCM C8051FC40 and FM20L08 Expansion Circuits

Published:2011/7/26 2:05:00 Author:Michel | Keyword: SCM, Expansion Circuits

SCM C8051FC40 and FM20L08 Expansion Circuits
SCM C8051FC40 and FM20L08 Expansion Circuits
SCM C8051FC40 and FM20L08 Expansion Circuits
SCM C8051FC40 and FM20L08 Expansion Circuits
SCM C8051FC40 and FM20L08 Expansion Circuits

The monolithic integrated circuit expansion already has many mature examples and this paper will not list again and the above picture is monolithic conrolling FRAM principle circuit.The address signals multiplexing mode is used in the system, so they can produce ALE signal. FM20LO8 itself has latches and it chooses signal CE can not like SRAM and it needs precharging time and the signal produces HC04 and HC32.And the falling edge of address signals needs to lock and save and the expansion is shown as the above picture.   (View)

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POSITIVE_REGULATO_WITH_o_TO_70_V_OUTPUT

Published:2009/6/23 4:34:00 Author:May

POSITIVE_REGULATO_WITH_o_TO_70_V_OUTPUT
The op amp has one input at ground and a reference current drawn from its summing junction. With this arrangement, the output voltage is proportional to setting resistor R2. A negative supply is used to operate the op amp within its common-mode range, providing zero output with sink current and power a low-voltage bandgap reference, D1. The current drawn from this supply is under 150 mA, except when sinking a load current. The output load capacitor, C2, is part of the op-amp frequency compensation.   (View)

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Active / Passive Phono Preamplifier Circuit

Published:2011/7/18 6:00:00 Author:Felicity | Keyword: Active / Passive Phono, Preamplifier Circuit

Active / Passive Phono Preamplifier Circuit
  (View)

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PHOTODIODE_ANIPLIFIEB

Published:2009/6/22 22:41:00 Author:May

PHOTODIODE_ANIPLIFIEB
A photodiode amplifier combined with a dc-restoration circuit will reject low-frequency ambient backgroud,easing measurement of a light signal.   (View)

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12_V_HIGH_VOLTAGE_SUPPLY_FOR_HE_NE_LASER

Published:2009/6/22 22:25:00 Author:May

12_V_HIGH_VOLTAGE_SUPPLY_FOR_HE_NE_LASER
T1 is a 6-V:330-V dc/dc inverter transforlrter with a 57.4:1 turn ratio, rated at 7W.R1 270-Ω resistorR2 180-kΩ resistor, 3 to 5 W C1 22-μF electrolytic capacitorC2 1-μF electrolytic capacitorC3-C6 0.02-μF capacitor,1 kV or moreD1 1N4001 diodeD2-D5 High-voltage diode(3 kV or more)Q1 TIP 140 power transistor T1 High-voltage dc-to-dc converter transformer; see text for speciftcattons All resistors are 5 to 10% tolerance, 1/4 W, unless otherwise indicated. All capacitors are 10 to 20% tolerance, rated 35 V or more, unless otherwise indicated.   (View)

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EMERGENCY_TELEPHONE_DIALER

Published:2009/6/22 22:22:00 Author:May

EMERGENCY_TELEPHONE_DIALER
This system will alert you or anyone chosen by automatically dialing a programmed phone num-ber. This is accomplished by monitoring an open-loop or closed-loop sensor switch located in the protected area. When the sensor detects a problem (such as a break-in, fire, heating system failure, flood, etc.), Teleguard dials whatever telephone number has been programmed into its memory. When the phone is taken off the hook, Teleguard emits an unusual tone to alert the party on the re-ceiving end that something is amiss.The circuit is not hampered by busy signals when a call is placed; it automatically redials the number again and again (about once a minute) until it gets through. In addition, Teleguard can also automatically dial a number in the event of a medical emergency; for instance, where a mobility-im-paired person is unable to dial the telephone. That can be accomplished by adding a panic switch to the circuit.   (View)

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21_GAME

Published:2009/6/22 22:21:00 Author:May

21_GAME
21_GAME
21_GAME

Two 2N2647 unijunction transistors serve as the Clock generators for the two 4017 ICs,A single“deal”push-button switch,S1,operates both Clock generators at the same time,Diodes D1 and D2 isolate the two Clock circuits,allowing S1 to operate both.The 4017 counter/readout circuits are identical In circuitry and operation As long as Clockpulses enter pin 14 of each 4017,the ICs count from 1 to 10 over and over until the clock pulses stopWhen S1 is released,the clock pulses stop and one LED from each IC remalns on to indicate a cardwith a number value of 1(1 or 11) to 10.The position of switches S2 and S3 determines whether the number 1 (“Ace”)output of the 4017s count as an 11 or a 1,Both S2 and S3 can be switched in either position before or after thecards are played.The cards can be played either face up OI face down,When switches S4 and S5 are in the position shown in the figure,the cards are dealt face down,Transistors Q3 and Q4 are turned off in thisposition and no current can flow through the LEDs Pressing S6 turns both transistors on,lightingthe LEDs.   (View)

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MUSIC_ON_HOLD

Published:2009/6/22 22:14:00 Author:May

MUSIC_ON_HOLD
When an asterisk * is pressed on the touch-tone phone, IC1 a DTMF decoder, controls on-hold logic. Audio from the FM receiver IC4 is placed on the telephone line when a hold condition is present. RY2 is a DPDT 12-V relay. To place a caller on hold, press the asterisk button on the touch-tone phone and hang up the handset.   (View)

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WHEEL_OF_FORTUNE

Published:2009/6/19 3:48:00 Author:May

WHEEL_OF_FORTUNE
The oscillation of Q2 is amplified by Q3 and fed to Johnson counter IC1. The output of IC1 drives the LEDs in sequence to give the impression of a spinning red ball.   (View)

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DIGITAL“FIRST_TO_RESPOND”BOX

Published:2009/6/19 3:44:00 Author:May

DIGITAL“FIRST_TO_RESPOND”BOX
This device is useful for quizzes and games to determine first response. U1 is an octal D type latch IC, an 74LS373.When a button is pushed, this circuit lights the corresponding LED. Q1 conducts, sounding an alarm (BZ1) connected to driver Q3, and Q1 supplies bias to Q2, disabling the rest of the latches in U1.   (View)

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ELECTRONIC_ONE_ARM_BANDIT

Published:2009/6/19 3:42:00 Author:May

ELECTRONIC_ONE_ARM_BANDIT
The one-arm bandit circuit is made up of three clock circuits and three counter/readout circuits.A single roll switch, 51, turns on all three clocks at the same time. When S1 is closed, capacitors C4, C5, and C6 are charged through D31, D32, and D33 to about 8 V. After S1 is released, the three clocks run, taking energy from the three charged capacitors. As the capacitors discharge, the three clocks begin to slow down, producing the effect of the drums in a mechanical bandit slowing to a stop.The 4017's 10-output LEDs can be numbered or designated as apples, cherries, bells, wild cards, or anything you like to make the game more interesting. Additional logic circuitry can be added to the 4017 outputs to sound an alert or turn on a light when any three numbers or output items match.Three potentiometers, R12, R13, and R14, can be varied for each roll to change the clock's fre-quency and the roll rate.   (View)

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