# help with easy circuit thanks

B

#### Big House

Jan 1, 1970
0
Hello

I need a simple circuit, so I ask you the simpliest way to do it

All I need to do is this. I have a Vin of 9volts (battery), I need to
have a Vout=Vin for a few milliseconds (or even a few seconds is fine)
and then Vout=0. So the goal is: when you connect the battery Vout=Vin
for a few milliseconds/seconds (not important how long) and the Vout=0

Thanks

I

#### Ian Stirling

Jan 1, 1970
0
Big House said:
Hello

I need a simple circuit, so I ask you the simpliest way to do it

All I need to do is this. I have a Vin of 9volts (battery), I need to
have a Vout=Vin for a few milliseconds (or even a few seconds is fine)
and then Vout=0. So the goal is: when you connect the battery Vout=Vin
for a few milliseconds/seconds (not important how long) and the Vout=0

A switch.

S

#### Slurp

Jan 1, 1970
0
Big House said:
Hello

I need a simple circuit, so I ask you the simpliest way to do it

All I need to do is this. I have a Vin of 9volts (battery), I need to
have a Vout=Vin for a few milliseconds (or even a few seconds is fine)
and then Vout=0. So the goal is: when you connect the battery Vout=Vin
for a few milliseconds/seconds (not important how long) and the Vout=0

Thanks

Put a relay coil across your input with the NC contacts feeding the circuit.
Put battery across input, circuit gets full volts, relay energises and
disconnects circuit.

P

#### petrus bitbyter

Jan 1, 1970
0
Big House said:
Hello

I need a simple circuit, so I ask you the simpliest way to do it

All I need to do is this. I have a Vin of 9volts (battery), I need to
have a Vout=Vin for a few milliseconds (or even a few seconds is fine)
and then Vout=0. So the goal is: when you connect the battery Vout=Vin
for a few milliseconds/seconds (not important how long) and the Vout=0

Thanks

These "simple" questions too often provide too little details to be
answered. From the question "as is" the answer will be "use a pushbutton, an
NO (normally open) type."

petrus bitbyter

B

#### Big House

Jan 1, 1970
0
well, it has to be it by itself without a switch... basically what I
need is an automatic swtich...

thanks

B

#### Big House

Jan 1, 1970
0
well, it has to do it by itself! basically I need an automatic
switch... Thanks

G

#### Genome

Jan 1, 1970
0
Big House said:
Hello

I need a simple circuit, so I ask you the simpliest way to do it

All I need to do is this. I have a Vin of 9volts (battery), I need to
have a Vout=Vin for a few milliseconds (or even a few seconds is fine)
and then Vout=0. So the goal is: when you connect the battery Vout=Vin
for a few milliseconds/seconds (not important how long) and the Vout=0

Thanks

I am think you am need P-channel mosfet wiv RC thing on gate.

Also, get Gucci peeple to present things from other side of paper but don't
tell gearbox designers..... wink wink....#

DNA

P

#### petrus bitbyter

Jan 1, 1970
0
Big House said:
Hello

I need a simple circuit, so I ask you the simpliest way to do it

All I need to do is this. I have a Vin of 9volts (battery), I need to
have a Vout=Vin for a few milliseconds (or even a few seconds is fine)
and then Vout=0. So the goal is: when you connect the battery Vout=Vin
for a few milliseconds/seconds (not important how long) and the Vout=0

Thanks

These "simple" questions too often provide too little details to be
answered. From the question "as is" the answer will be "use a pushbutton, an
NO (normally open) type."

petrus bitbyter

J

#### John Fields

Jan 1, 1970
0
Hello

I need a simple circuit, so I ask you the simpliest way to do it

All I need to do is this. I have a Vin of 9volts (battery), I need to
have a Vout=Vin for a few milliseconds (or even a few seconds is fine)
and then Vout=0. So the goal is: when you connect the battery Vout=Vin
for a few milliseconds/seconds (not important how long) and the Vout=0

---

View in Courier:

+
+--[CAP]--+--O
| | | O--->Vout
| | +--> |
[BATTERY] [COIL]- - -|
| |
+---------+----------->GND

Cap is whatever it takes to keep the relay made (1000µF??) as long
as you want when the battery gets connected to the cap.

J

#### John Fields

Jan 1, 1970
0
Hello

I need a simple circuit, so I ask you the simpliest way to do it

All I need to do is this. I have a Vin of 9volts (battery), I need to
have a Vout=Vin for a few milliseconds (or even a few seconds is fine)
and then Vout=0. So the goal is: when you connect the battery Vout=Vin
for a few milliseconds/seconds (not important how long) and the Vout=0

---

View in Courier:

+
+--[CAP]--+--O
| | | O--->Vout
| | +--> |
[BATTERY] [COIL]- - -|
| |
+---------+----------->GND
Oops...

+------------+
| + |
+--[CAP]--+ O
| | | O--->Vout
| | +--> |
[BATTERY] [COIL]- - -|
| |
+---------+----------->GND

P

#### petrus bitbyter

Jan 1, 1970
0
Big House schreef:
well, it has to do it by itself! basically I need an automatic
switch... Thanks

Well,

That's exactly my point. *When* do you need this temporary Vout=9V?
When the telephone rings? When the rain falls, or the nukes? When your
mother in law arrives or when she departs? Sometime something has to
activare that circuit but you did not mention anything in your
question.

petrus bitbyter

J

#### Jim Thompson

Jan 1, 1970
0
[snip]
I am think you am need P-channel mosfet wiv RC thing on gate.
[snip]
DNA

GRAMMAR ERROR! GRAMMAR ERROR! GRAMMAR ERROR!

It should be "wiv RC thingy", not "RC thing" ;-)

...Jim Thompson

B

#### Big House

Jan 1, 1970
0
would be too complex to explain, however let's say this.

- you plug the battery
- Vin=Vout for a short period of time
- after that, Vout=0 with Vin still connected.

That's it
Thank you very much!

B

#### Big House

Jan 1, 1970
0
Hello

what I need is simply this:

t=0, Vin=0, Vout=0
t=1, Vin=9, Vout=9
t=2, Vin=9, Vout=0

where t is in seconds (even though I do not need it precise, just a
chance of status in a "few moments") Thanks

J

#### Jim Thompson

Jan 1, 1970
0
Hello

what I need is simply this:

t=0, Vin=0, Vout=0
t=1, Vin=9, Vout=9
t=2, Vin=9, Vout=0

where t is in seconds (even though I do not need it precise, just a
chance of status in a "few moments") Thanks

When you connect the battery? As in a power-on-reset?

...Jim Thompson

B

#### Big House

Jan 1, 1970
0
when I physically put the wires on the battery... thanks

S

#### Spehro Pefhany

Jan 1, 1970
0
Hello

what I need is simply this:

t=0, Vin=0, Vout=0
t=1, Vin=9, Vout=9
t=2, Vin=9, Vout=0

where t is in seconds (even though I do not need it precise, just a
chance of status in a "few moments") Thanks

Are the changes in Vout driven by the input in the first case, and by
time in the second case?

Ie. wait for Vin to go high, then Vout = high for 1 second?

Best regards,
Spehro Pefhany

K

#### Ken Taylor

Jan 1, 1970
0
Big said:
when I physically put the wires on the battery... thanks
Use John's earlier capacitor and relay option. Easiest so far.....

Ken

J

#### Jamie

Jan 1, 1970
0
Big said:
Hello

I need a simple circuit, so I ask you the simpliest way to do it

All I need to do is this. I have a Vin of 9volts (battery), I need to
have a Vout=Vin for a few milliseconds (or even a few seconds is fine)
and then Vout=0. So the goal is: when you connect the battery Vout=Vin
for a few milliseconds/seconds (not important how long) and the Vout=0

Thanks
you need a one shot timer.
look up 555 and one shot timer in google.

J

#### John Fields

Jan 1, 1970
0
Use John's earlier capacitor and relay option. Easiest so far.....

---

maybe this'll make it even easier for him to visualize:

.. +------------+-------->Vin
.. | + |
.. +--[CAP]--+ O
.. | | | O--->Vout
.. | | +--> |
.. [BATTERY] [COIL]- - -|
.. | |
.. +---------+----------->GND

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