Control Circuit

REMOTE_RING_EXTENDER_SWITCH

Published:2009/6/25 22:15:00 Author:May

The circuit can operate lamps and buzzers from the 120V, 60 Hz power line while main-taining positive isolation between the tele-phone line and the power line. Use of the iso-lated tab triac simplifies heat sinking by removing the constraint of isolating the triac heat sink from the chassis.   (View)

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10_A_25_Vdc_SOLID_STATE_RELAYS

Published:2009/6/25 21:57:00 Author:May

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TWO_CHANNEL_SWITCH

Published:2009/6/25 21:56:00 Author:May

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HIGH_FREQUENCY_SWITCH

Published:2009/6/25 21:53:00 Author:May

The 2N4391 provides a low ON resistance of 30 ohm and a high OFF impedance (＜0.2 pF) when off. With proper layout and an ideal switch, the performance stated above can be readily achieved.   (View)

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DIFFERENTIAL_ANALOG_SWITCH

Published:2009/6/25 21:52:00 Author:May

The NPD5566 monolithic dual is used in a differential multiplex application where Rd,coN) should be closely matched. Since Rd,coN) for the monolithic dual tracks at better than ±1% over wide temperature ranges (- 25℃ to +125℃), this makes it an unusual but ideal choice for an accurate multiplexer. This close tracking greatly reduces errors due to common-mode signals.   (View)

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TRIAC_ZERO_VOLTAGE_SWITCHING

Published:2009/6/25 21:55:00 Author:Jessie

The triac will be gated on at the start of the positive half cycle by current flow through the 3 μF capacitor as long as the C103 SCR is off. The load voltage then charges up the 1 μF capacitor so that the triac will again be ener-gized during the subsequent negative half cycle of line voltage. A selected gate triac is required because of the triggering mode.   (View)

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HIGH_FREQUENCY_SWITCH

Published:2009/6/25 21:53:00 Author:Jessie

The 2N4391 provides a low ON resistance of 30 ohm and a high OFF impedance (＜0.2 pF) when off. With proper layout and an ideal switch, the performance stated above can be readily achieved.   (View)

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DIFFERENTIAL_ANALOG_SWITCH

Published:2009/6/25 21:52:00 Author:Jessie

The NPD5566 monolithic dual is used in a differential multiplex application where Rd,coN) should be closely matched. Since Rd,coN) for the monolithic dual tracks at better than ±1% over wide temperature ranges (- 25℃ to +125℃), this makes it an unusual but ideal choice for an accurate multiplexer. This close tracking greatly reduces errors due to common-mode signals.   (View)

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HIGH_TOGGLE_RATE_HIGH_FREQUENCY_ANALOG_SWITCH

Published:2009/6/25 21:49:00 Author:Jessie

Commutator circuit provides low tmpedance gate drive to the PN4091 analog switch for both on and offdrive conditions．This circuit also approaches the ideal gate drive conditions for high frequency signal handling by providing a low ac impedance for off drive and high ac impedance for on drive to the PN4091   (View)

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DTL_TTL_CONTROLLED_BUFFERED_ANALOG_SWITCH

Published:2009/6/25 21:48:00 Author:Jessie

This analog switch uses the 2N4860 JFET for its 25 ohm ron and low leakage. The LM102 serves as a voltage buffer. This circuit can be adapted to a dual trace oscilloscope chopper. The DS7800 monolithic IC provides adequate switch drive controlled by DTL/TTL logic levels.   (View)

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SQUAREWAVE_OSCILLATOR

Published:2009/6/25 21:43:00 Author:Jessie

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SIMPLE_TRIANGLE_SQUARE_WAVE_OSCILLATOR

Published:2009/6/25 21:42:00 Author:Jessie

Circuit Notes By making Rr variable it IS possible to alter the operating frequency over a 100 to 1range，Versatile triangle/square wave oscillator has a possible frequency range of 0.1 Hz to 100 kHz.   (View)

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SOUND_OPERATED_TWO_WAY_SWITCH

Published:2009/6/25 21:20:00 Author:May

This circuit operates a relay each time a sound of sufficient intensity is made, thus one clap of the hands will switch it one way, a second clap will revert the circuit to the origi-nal condition. Q2 and Q3 form a Schmitt trigger. TheJK flip-flop is used as a bistable whose output changes state every time a pulse is applied to the clock input (pin 12). Q4 allows the output to drive a relay.   (View)

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SOUND_ACTIVATED_RELAY

Published:2009/6/25 21:19:00 Author:May

The device remains dormat (in an off con-dition) until some sound causes it to turn on. The input stage is a 741 operational amplifier connected as a noninverting follower audio amplifier. Gain is approximately 100. To increase gain raise the value of R2. The amplified signal is rectified and filtered to a dc level by R4. Then R5 is set to the audio level desired to activate the relay.   (View)

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PRECISION_RECTIFIERS

Published:2009/6/25 21:23:00 Author:Jessie

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AUDIO_OPERATED_RELAY

Published:2009/6/25 21:15:00 Author:May

Q1 and Q2 are general purpose transis-tors. The 10 K input pot is adjusted to a point just short of where Q1 turns on as indicated by K pulling in. K is any 5 V reed relay. With the values shown for R (100 K) and C (47 μF), timing values from.05 to slightly over 5 sec-onds can be achieved. B shows the addition o f a 22 K series resistor to the 10 K input pot if a 12 V supply is used. A suitable 12 V reed relay must be used at K.   (View)

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ULTRA_PRECISE_LONG_TIME_DELAY_RELAY

Published:2009/6/25 21:12:00 Author:May

Circuit NotesPredictable time delays from as low as 0.3 milliseconds to over 3 minutes are obtainable without resorting to a large value electrolytic-type timing capacitor. Instead, a stable low leakage paper or mylar capacitor is used and the peak point urrent of the timing UJT (Q1) is effectively reduced, so that a large value emit-ter resistor (R1) may be substituted.   (View)

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SIMPLE_TIME_DELAY

Published:2009/6/25 21:15:00 Author:Jessie

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AUDIO_OPERATED_RELAY

Published:2009/6/25 21:15:00 Author:Jessie

Q1 and Q2 are general purpose transis-tors. The 10 K input pot is adjusted to a point just short of where Q1 turns on as indicated by K pulling in. K is any 5 V reed relay. With the values shown for R (100 K) and C (47 μF), timing values from.05 to slightly over 5 sec-onds can be achieved. B shows the addition o f a 22 K series resistor to the 10 K input pot if a 12 V supply is used. A suitable 12 V reed relay must be used at K.   (View)

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LONG_DURATION_TIME_DELAY

Published:2009/6/25 21:14:00 Author:Jessie

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