Electronic Timer
Todays deals on Electronic Timer?
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ELECTRONIC INFINITE RANGE CONTROLLER 240V 40A 1 OR 3 PH $600.00 |
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Quest Electronics M7B Noise Dosimeter & Calibrator 32 with Timer $599.99 |
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TABOR ELECTRONICS UNIVERSAL COUNTER/TIMER MODEL 6030 $399.00 |
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Intermatic ET70115CR ELECTRONIC TIME SWITCH NEW $330.00 |
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@N3 ATC ARM120AAE Tripexors Alternating Controller Electronics Switch ARM $299.95 |
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Intermatic ET70115C Electronic Energy Control Timer $299.00 |
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TABOR ELECTRONICS 100MHz Universal Counter Timer 6003 $250.00 |
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NEW ELECTRONICS DISPLAYS (EDI) ED406-102-4D-N1 TIMER $289.99 |
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PARAGON EL71 ELECTRONIC TIME CONTROL LIGHTING TIMER $260.00 |
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Electronic Timer 079511 2 Channel Version $229.00 |
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ATC Diversified Electronics CP-15M-A Relay $249.97 |
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*NEW* Durant E4148793 Counter Timer Electronic 1 Setpoint $249.99 |
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Dalec Electronics #L50000-FR Counter/Timer (RPM) N 6/5 $212.50 |
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EAGLE SIGNAL DZ101A3 ELECTRONIC RESET COUNTER $200.00 |
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GEC ALSTHOM ETR 5 ETR5 Electronic Timer $159.00 |
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Paragon 277V Electronic Time Control EC7005PC/277V New $191.25 |
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INTERMATIC ELECTRONIC TIME SWITCH, MODEL ET70415CR $155.00 |
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Paragon EC7001/208-240 Electronic Time Control $150.00 |
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DIVERSIFIED ELECTRONICS AC-301-440 TIMER NEW AC301440 $149.95 |
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NEW —- GRASSLIN DIGI 20E-120 Electronic time switch timmer $150.00 |
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NEW —- GRASSLIN DIGI 42/2-120 2 Channel electronic time switch timmer $150.00 |
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Kubler Electronic Timer, Type 7.901.010.800.9370, 79010108009370 $125.00 |
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Intermatic ET102C Electronic 24Hour Time Switch NEW $125.45 |
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ASCO ADJUSTABLE ELECTRONIC TIMER 720/790 W/ ASCO WRG#2936 PNEUMATIC SOLENOID $129.99 |
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Intermatic Electronic Time Switch ET173C 20 Event Timer 7 Day Control 120V DPST $100.00 |
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Pilz 674045 ZFN Series 180s Electronic Timer Relay $101.22 |
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Grasslin MIL72A-DIGI16 Electronic Time Switch Timer $99.00 |
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ISSC Kanson Electronics On Delay 1071-1-P-1-B 120 V New $99.99 |
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NIB EAGLE/DANAHER ELECTRONIC RESET TIMER BRE5A601 $89.00 |
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IDEC ELECTRONIC OFF DELAY 11 PIN TIMER RTE-P22 LOT OF 5 $99.99 |
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NEW IN BOX HONEYWELL ST9120G 4004 ELECTRONIC FAN TIMER HQ1009838HW $99.00 |
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R-K Electronics Anti-Tiedown Timer ATB-115A-2 new $92.99 |
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CROUZET PANEL MOUNT ELECTRONIC TIMER 88.226.016, 24 VAC – 50 Hz $85.00 |
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KEP Electronic 12 Hour Clock Module SHM-1260Hz/SHM 115V $79.99 |
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Tenor Controls Electronic Timer 655-8-3000-05433 $80.00 |
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Cutler Hammer TRF1P120AC Electronic Timer 120VAC 10AMP 0-1 second $89.99 |
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Chromalock CS 353 Electronic Timer Time Delay 0-10 Second 24 Volt DC VDC $75.00 |
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NEW R-K ELECTRONICS CCB115A13S ON DELAY PLUG IN TIMER $79.99 |
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INTERMATIC MODEL ET715C ELECTRONIC 7 DAY TIME SWITCH $69.99 |
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NEW Intermatic Electronic Time Switch ET70215C $75.00 |
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idec GT3W-A66AF20 Electronic Timer Multi-Range $69.99 |
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Intermatic ET-297C Dp Electronic time clock $75.00 |
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Diversified Electronics TDU-120-AKA Programmable Timer Relay $84.99 |
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NIB R-K Electronics timer relay CFB-115A-2-10M $79.99 |
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Vintage Rain Bird Electronic Time Switch EZ-701-2M Clock 7 Day – NEW $69.00 |
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Lester Lestronic II Electronic Timer 09664 48 volt CU885086 DPE H-1808 NEW $69.99 |
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Durant Solid State 1600 Electronic Counter 1600-411 NEW $75.00 |
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EAGLE SIGNAL DG109B3 ELECTRONIC TIMER $75.00 |
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Eagle Signal Timer BRE8A6 – Electronic Reset – 120 VAC – Surface Mount – 10 Min. $74.99 |
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Paragon Electric Co. EC700/120 Single Channel Electronic Time Controller $59.95 |
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Idec Electronic Timer GT3F-2EAF20 $65.00 |
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NEW WITH BOX INSTRUCTIONS DAYTON 7 DAY ELECTRONIC TIMER FOUR POLE DOUBLE THROW $59.99 |
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1 ELECTRONIC TIMER LR2-K0306 OVERLOAD RELAY Q3-2 $59.99 |
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Intermatic P171 C41 Electronic 7-Day Timer Switch $59.99 |
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IVO COUNTERS F-574T 60A ELECTRONIC COUNTER / TIMER $59.99 |
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Diversified Electronics Sequential Timer TDF-120-DKB-24H 14.4M to 24H $59.96 |
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R-K Electronics ATB-115A-2 115VAC Anti-Tiedown Timer $67.50 |
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EAGLE SIGNAL CONTROLS BR15A6 ELECTRONIC RESET TIMER $60.00 |
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Idec Corp. RTEP21 Electronic Timer, 12 vac/dc, Capacitor $39.95 |
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CROUZET ELECTRONIC TIMER 88.225.011 (New in Box) $49.00 |
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PS Syracuse Electronics TSR-00603 Timing Relay 5 Second $44.00 |
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IDEC RTE-PI1 Electronic Timer (NIB) $40.00 |
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NIB R-K ELECTRONICS INC. TIMER ON DELAY, 115VAC, 50/60 CYCLE, ADJ. 0.1 TO 10 SEC $50.00 |
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NIB R-K ELECTRONICS INC. UNIVERSAL TIMER, MODEL NO. TUB-24-2 $50.00 |
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Asco Adjustable Electronic Timer 272839-001 $55.00 |
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IDEC GE1A-C GE1AC Electronic Timer $19.00 |
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IDEC Electronic Timer GE1A-B10MAD24 (GE1AB10MAD24) NIB! $54.00 |
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IDEC Electronic Timer GE1A-C10MAD24 (GE1AC10MAD24) NIB! $54.00 |
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New Idec RTE-B2AD24 Electronic Timer Relay 24VAC/DC $40.00 |
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Idec GT3F-2A100 Electronic Timer GT3 GT3F-2 True Power $38.73 |
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26034 Old-Stock, IDEC RTE-P2AF20 Electronic Timer 100-120VAC $47.49 |
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Struthers Dunn Electronic Relay FC6 495 FC-6-495 FC6495 $50.00 |
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PS Syracuse Electronics TVR-00611 60sec. Timer Relay $48.95 |
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Hanyoung Electronic Company 8 Pin Timer Relay HY-T57A $50.99 |
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R-K Electronics, Inc. CLRB-115A-2-2M-1M Timer-Repeat Cycle, 120/240VAC $50.40 |
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Idec Electronic Timer RTE-P1AF20 $45.00 |
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ATC Diversified Electronics TDU-120-AKA Programmable Timer Relay $49.99 |
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Syracuse Electronics TVR-00303, timer, 5sec, 115v $40.00 |
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7 – Legrand / PS / Syracuse Electronics, TNR/D-00208, 30 Sec, 24V Timers $38.00 |
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IDEC RTE-P1AF20 Electronic Timer 100-240VAC $39.99 |
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ICM MDR115A2Z60 ELECTRONIC TIMER 0.6 to 60 SECONDS 60SEC, TIME DELAY RELAY – NEW $45.50 |
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ALLEN BRADLEY 100-ETAZJ30 ELECTRONIC TIMER 1-30S NEW $39.99 |
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Allen Bradley 100-ETA3 Electronic Timer NIB $39.95 |
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EXTECH ELECTRONIC TIMER COMPU3000 $39.99 |
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Nutone Digital Electronic Programmable Timer 15A *NEW* $34.99 |
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IDEC RTE-B21 ELECTRONIC TIMER 24VAC/DC CONTACT 10A $34.99 |
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IDEC RTE-PI1 Electronic Timer W/Socket $26.50 |
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Idec 0-10 Minute 24VDC Electronic Timer RTE-PN1 NIB NR $42.49 |
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GE GRASSLIN ET-616 ELECTRONIC INTERVAL TIMER -**NEW** $37.50 |
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IDEC IZUMI CORP CD5L-MK619 ELECTRONIC COUNTER TIMER – NEW/NO BOX/SURPLUS w/WARRA $42.25 |
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Intermatic ET170 Digital Electronic 7 Day 10 Event Time Switch NOS Timer $30.00 |
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IDEC RTE-PS1 ELECTRONIC TIMER 120V 50/60Hz $34.95 |
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IDEC RTE-PI1 Electronic Timer $25.00 |
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idec RTE-B1AF20 Electronic Timer 0-1min $24.99 |
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New digital Red Lion CUB4L020 miniature electronic counter timer 6 digit CUB4L $34.99 |
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EAGLE SIGNAL DG105A3 ELECTRONIC TIMER $40.00 |
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Paragon Single Channel Electronic Timer Control EC7000/120 volt $29.99 |
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CUTLER HAMMER ELECTRONIC TIMER TRF 1P 120VAC 10AMP 0-1 SEC $30.00 |
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Grasslin ET616 Electronic Interval/Countdown Timer NEW $39.00 |
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INTERMATIC HB71R ELECTRONIC 7DAY DIGITAL OUTDOOR TIMER $27.88 |
Electronic Timer Questions
555 Timer- Use In Electronic Circuits
There are a lot of circuits using 555 Timer IC. To know more about it, the block diagram must be explained in detail. A basic 555 timer consists of two operational amplifiers a set-reset flip-flop and two transistors. The operational amplifiers are designed to work as comparators. There will also be a voltage divider circuit which is built with the help of a resistive network. Each comparator is used to compare the threshold voltage with a reference voltage. The first comparator COMP 1 compares with a reference voltage of +2/3 Vcc. The second comparator COMP2 compares with a reference voltage of +1/3 Vcc. After comparing the voltages, their respective outputs are given to the input of the flip-flop.
From the pin configuration of a 555 timer you can see that a transistor is placed as a discharger whose collector terminal is connected to pin 7. The output of the flip flop is given to this transistor. According to the output, the transistor switches to its cut-off region or saturation region.
When the transistor is in the saturation stage, it provides a discharge path to an externally connected capacitor. Another separate connection is regarding the RESET terminal. A pulse given to this terminal will reset the whole 555 timer circuit. This pulse is provided with the help of another transistor.
The COMP 1 includes two inputs – A threshold input [pin 6] and a control input [pin 5]. Mostly, the pin 5 is not used and hence the control voltage will be equal to +2/3 Vcc. This pin is mostly used to change the switching levels. If not used, a capacitor of very small value is placed in between pin 5 and the ground. This will help in stopping the noise and thus stop false triggering. The capacitor value will be of 0.01 nano farad. The output of COMP1 is given to the SET [S] input of the S-R Flip-Flop. When comparing the voltages, if the reference voltage is less than the threshold voltage, the output will go to a high state. This high state causes the transistor to discharge through the external capacitor at pin 7. Pin 3 is the output, which receives the complimentary signal from the flip-flop. It will thus be in the low state. All these conditions will be in a standby as long as the COMP 2 triggers the flip-flop. Another point to note is that COMP 1 can only help in providing a high output for the flip-flop
. Even if the threshold voltage is lesser than the reference voltage, COMP 1 will not set the flip-flop to change again. For the flip-flop to reset, the threshold voltage must fall below +1/3 Vcc. As soon as this occurs, COMP 2 provides a trigger in the flip-flop and thus forces it to provide a low output. This in turn produces a HIGH output at the output pin because the reset of the flip-flop causes the discharge transistor to turn off. Like the COMP 1, the COMP 2 can only make the flip-flop to go to a low output. It cannot set the state again.
Thus 555 timer basics are that a low output is produced in the 555 timer when the threshold voltage is more than the reference voltage of +2/3 Vcc. This causes the discharge transistor to turn ON. To make the output high, the threshold voltage must fall below +1/3 Vcc. This will cause the discharge transistor to go in the OFF mode. You must also note that when the RESET pin is not used, it must be circuited to the Vcc.
A lot of electronic circuits using the application of 555 timer are being designed nowadays. Some of the applications include:
555 timer astable multivibrator
555 timer monostable multivibrator
555 timer oscillator circuit
555 timer ramp generator
Though they are used in other electronic circuits, they are mostly used to perform any of the operations mentioned above.
555 Timer Astable Multivibrator:
The astable multivibrator is used to produce a rectangular wave. As this circuit does not need an external trigger for switching the output state, it is also called a free running oscillator. The connection must be given exactly as the circuit diagram. That is, the pin 4 and pin 8 should be connected to the + Vcc supply. Pin 1 should be grounded. The output must be taken from pin 3. Also pin 2 and pin 6 should be connected to a capacitor and then given to the ground. Most important of all is the resistors and capacitor that is connected externally. Their values determine the switching time of the 555 timer.
555 Timer Monostable Multivibrator:
To obtain a monostable multivibrator, there should be a change of state from stable to quasi-stable. For this, a trigger input like a very small width negative pulse must be given with an amplitude that is greater than +2/3 Vcc to the 2nd pin of the 555 timer IC. But in quiescent condition of the output, the input must be kept at Vcc volts. Pin 1 should be in the grounded state. As usual do not forget to ground the 5th pin with a 0.01 micro farad capacitor in between. A resistor should be given between the pins 6 and 8. The 8th pin is connected to the positive supply.
555 Timer Oscillator Circuit:
This electronic circuits is generally known as a voltage to frequency converter. It is called so because the frequency obtained in the output can be easily changed by changing the voltage in the input. To make this possible the 5th pin of the 555 timer is given an external voltage with the help of a potentiometer. Thus a change in the pot value will change the control voltage of the circuit. When the control voltage increases, the discharge time of the capacitor increases and hence the output frequency decreases. When control voltage is reduced, the capacitor discharges soon and thus the frequency in the output increases.
555 Timer Ramp Generator:
As the name specifies, this circuit is used to generate a ramp circuit. The basic idea is to charge a capacitor with the help of a voltage source through a resistor. This will produce an exponential waveform. At the same time the capacitor is charged from a constant current source which helps in producing a ramp. Another important point to note is about the transistor that is used. Other than other electronic circuits using 555 timer, where a NPN transistor is used, here a PNP transistor is used. This is what helps in making a constant charging current.
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