Bi-stable switch circuit for on/off by single pulse

[rajbarath_eee]

help needed for a Bi-stable switch circuit for on/off by single pulse. the output 'toggles' ON for a pulse then 'OFF' for
the next pulse and so on,,,,
need circuit for dis operation.for powering a circuit or led's.

 

[ericgibbs]

help needed for a Bi-stable switch circuit for on/off by single pulse. the output 'toggles' ON for a pulse then 'OFF' for
the next pulse and so on,,,,
need circuit for dis operation.for powering a circuit or led's.

hi,
This is a basic circuit.

 

[4pyros]

you should be able to do this with a LM555 and get 200ma output. Andy

 

[rajbarath_eee]

am very much pleased with ur reply.., and 'l b asking more on rf wireless in future.and for my doubts in power electronics.

 

[rajbarath_eee]

here is wat i really need for my project
a electronic switch (semiconductor or flip flop) which output 'toggles' ON for a pulse then 'OFF' for
the next pulse and so on,,,,

bcoz the pulse is the output of the rf reciever module 315mhz,
for turning power on/off for a led or a circuit.

and also i need to know whether the electronic switch which i need can b replaced by BJT FET or other
transistor or only can b done by a flip flops , 555timer ?

next i want to know ,abt wireless. is der any other way to put a wireless rather den a rf module for
my simple on/off signal to jus turn on and turn off my circuit?
if only rf module could b used, do i need any program for the decoder and encoder.

needed to know abt

1 electronic toggle on/off TRANSISTOR or FLIP FLOP switch for single pulse (name of the component) (pin details)

2 connection and circuit details of rf module 315mhz (transmitter/receiver) (pin details)

3 encoder(HT12E) and decoder (HT12D) program, needed r not ? if needed , program (pin details)

4 And my circuit is all around 3 volts totaly

5 And plz dont say to c data sheets for pin details , i need it practically by ur own words.

 

[koolguy]

Hi,
you can see HT 12E/D tutorial in you tube.

 

[awt]

Hi rajbarath,

The one with flip flops or 555timer seem simpler. Since u are requesting for one with bjt, check the link below for one.

**broken link removed**

Good luck

 

[awt]

Hi rajbarath_eee,

Flip flop or 555timer seem to be simpler. Since you requested for the one with bjt, you can check the link below.

**broken link removed**
good luck

 

[awt]

Hi rajbarath_eee,

One with flip flop or 555timer is seem to be simpler. Since you requested for one that uses bjt, you can check the link below

**broken link removed**

Good luck

 

[4pyros]

Thay are to cheep to make;
DC 12V Wireless Remote Control Switch & Four Keys Universal Wireless Remote Control AK-RK04S-12+AK-BF04 - DinoDirect.com

 

[DerStrom8]

hi,
This is a basic circuit.

Just in case you want to use this circuit, I am pretty sure that Cd1 should be connected to ground, not +5V. A simple mistake in the labeling of the circuit.

 

[KMoffett]

Just in case you want to use this circuit, I am pretty sure that Cd1 should be connected to ground, not +5V. A simple mistake in the labeling of the circuit.

According to page 2 of the data sheet both SD1 (SET on LO) and CD1 (CLEAR on LO) are required to be high to toggle the output in that circuit.

Ken

 

[ronsimpson]

When I use a simple push button switch, it bounces several times. This will make the FF toggle several times. Hopefully there will be an odd number of switch bounces.

 

[KMoffett]

So, the input pulse is an electromechanical switch. As you discovered, these do not always produce a single pulse when pressed. You need to add a "debounce" circuit. I assume that you want it toggled when you press the button, as opposed to when you release it. This is a positive-edge-triggered flip-flop. Swap the resistor and switch positions, and place a 0.1uF capacitor across the pushbutton switch.

Ken

 

[ericgibbs]

hi DS8,

If its a 74LS74 then the S and R pins need to be high for the circuit to toggle.

 

[DerStrom8]

According to page 2 of the data sheet both SD1 (SET on LO) and CD1 (CLEAR on LO) are required to be high to toggle the output in that circuit.

Ken

hi DS8,

If its a 74LS74 then the S and R pins need to be high for the circuit to toggle.

Okay, thank you guys for clearing that up. Sorry for the mistake

 

[shokjok]

Grounding the "CLR" pin will keep this flip-flop output as logic "1", SW1 will be ineffective. For counting, you could connect a 4017 counter such that the odd outputs are connected to the "CLR" inputs of cascading D flip-flops wired as a shift register.