# Apply voltage for X seconds

T

#### [email protected]

Jan 1, 1970
0
Does anyone know of a quick way to make a circuit closed for a certain
period of time after it receives a signal? It's been too long since
I've messed with most circuit components and I can't remember enough
specifics.

H

#### Homer J Simpson

Jan 1, 1970
0
Does anyone know of a quick way to make a circuit closed for a certain
period of time after it receives a signal? It's been too long since
I've messed with most circuit components and I can't remember enough
specifics.

Minimum and maximum time range?

J

#### John Fields

Jan 1, 1970
0
Does anyone know of a quick way to make a circuit closed for a certain
period of time after it receives a signal? It's been too long since
I've messed with most circuit components and I can't remember enough
specifics.

---
More than likely, a monostable multivibrator (AKA one-shot)

http://datasheets.maxim-ic.com/en/ds/ICM7555-ICM7556.pdf

What do you mean by "closed", how long a time, how much current will
the circuit need, and what will the signal to start the timer look
like?

A

#### Anthony Fremont

Jan 1, 1970
0
Does anyone know of a quick way to make a circuit closed for a certain
period of time after it receives a signal? It's been too long since
I've messed with most circuit components and I can't remember enough
specifics.

You need to furthre explain what you mean by "certain period of time",
seconds/minutes/hours/days? What do you want to happen if the "trigger"
event occurs again during the timing cycle? Should it be ignored or should
it restart the timing cycle? Perhaps a NE555 timer, 74hc123, 74hc221 or a
PIC depending.

J

#### Jamie

Jan 1, 1970
0
Does anyone know of a quick way to make a circuit closed for a certain
period of time after it receives a signal? It's been too long since
I've messed with most circuit components and I can't remember enough
specifics.
You need a One shot timer..
Look on the net for 555 timer examples.
I assume you need it to only close once and
release to not close again until you remove the
signal and recycle it?

W

Jan 1, 1970
0
J

#### John Fields

Jan 1, 1970
0
maybe feed the multivibrator into something like a 4106 bilateral
switch?

W

#### Walt Fles

Jan 1, 1970
0
Then the bilateral switch can complete a circuit and apply how much
voltage you need to.
Depending on what type of circuit needs the voltage and/or how much
voltage you may end
up using a diac or triac or scr.

M

#### Michael A. Terrell

Jan 1, 1970
0
Walt said:
Then the bilateral switch can complete a circuit and apply how much
voltage you need to.
Depending on what type of circuit needs the voltage and/or how much
voltage you may end up using a diac or triac or scr.

Have you ever actually USED a bilateral switch? They are low leve,
high impedance devices. They are not intnded to switch any current. The
on resistance is high, and the part number was 4016, not 4106. Also,
the 4016, and its sucessor, the 4066 are QUAD BILATERAL SWITCHES. Early
CMOS devices lock up if the voltage is outside the secified range, or
just quit working

--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.

Michael A. Terrell
Central Florida

W

#### Walt Fles

Jan 1, 1970
0
Have you ever actually USED a bilateral switch? They are low leve,
high impedance devices. They are not intnded to switch any current. The
on resistance is high, and the part number was 4016, not 4106. Also,
the 4016, and its sucessor, the 4066 are QUAD BILATERAL SWITCHES. Early
CMOS devices lock up if the voltage is outside the secified range, or
just quit working

--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.

Michael A. Terrell
Central Florida

Ive used them with op amps as a semiconductor replacement for an atari
joystick that worked quite well,
with a potentiometer joysticks hooked to them. That was when Radio
Shack sold such stuff.

M

#### Michael A. Terrell

Jan 1, 1970
0
Walt said:
Ive used them with op amps as a semiconductor replacement for an atari
joystick that worked quite well,
with a potentiometer joysticks hooked to them. That was when Radio
Shack sold such stuff.

That is a completely different application. You were working with
low signal levels, and high impedance circuits.

--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.

Michael A. Terrell
Central Florida

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