Re: Please suggest a time delay toggle switch



Fred Bloggs wrote: 


mingyan_chow@xxxxxxxxxxxx wrote:
 > Absolutely correct. One button selection is really limited. However,
 > this application is only for my turntable. I can get used to it. i.e.
 > press the button to "On" 33. Press again, "Off". While play 33 want to
 > switch to 45. Turn it off, then press the button long enough to toggle
 > 45 oscillator.

So the OFF-to-ON requires a five second button press, and the ON-to-OFF
does not, and successive OFF-to-ON's toggle the speed selection.

 > I think I got a workable circuit on my bread board now. Question, how
 > to feed two oscillator output to op-amp circuit.
 > The existing circuit has a 22K resistor connected to 4013 clock output
 > pin 12 (pin 12 connected with pin 5), 22 K is then connected with 5K VR
 > to set level. and other end of 5KVR connected with a 22U cap. to
 > ground. Output of 5K VR connect to LM324 via a 56K resistor.
 > Since I duplicated the same oscillator, can two oscillator ouput
 > connect to the same op amp input?
 >

Your description is ambiguous, it could mean anything, but any one of
the various opamp summer configurations will serve this purpose. You
state elsewhere that the ultimate output should be a 1Vpp. It would help
if you told us what power supplies and DC levels this circuit uses.
        View in a fixed-width font such as Courier.

.
.
.                                              12V
.                                               |
.                                               |
.                                               |
.      12V _   _                              |\|
.         | | | |     CLOCK1>--[22K]-+--------|+\
.        -   -   -                   |        |  >-+--+-->
.      0V             CLOCK2>--[22K]-+      +-|-/  |  |
.                                    |_     | |/|  |  |
.                                    |/|    |   |  |  |
.                     ADJ 2.2K -->  [5K]    +------+ [1K]
.                                   /|          |     |
.                                    |          |     |
.                                    +----------+-----+
.                                               |
.                                              ---
.                                              GND
.

If you want just a single time delay then this works, the ON/OFF FF1 toggles 3.5 seconds after pressing the button, and the speed select FF2 toggles when the ON/OFF FF1 transitions from ON->OFF:
View in a fixed-width font such as Courier.


.
.
.
.           +-----------+------------------------------> OFF TO
.           |    FF1    |                FF2             4066 RSTs
.           |  ON/OFF   | <-CD4013->    33/45
.           |           |            +-----------+
.           |   -----   |  1=OFF     |  -----    |
.           |  |     |  |  0=ON      | |     |   |
.           +--|D   Q|  |            +-|D   Q|---|-----> 33RPM
.              |     |  |              |     |   |            4066
.              |    _|  |              |    _|   |             RSTs
.           +-->CK  Q|--+-------------->CK  Q|---+-----> 45RPM
.           |  |     |                 |     |
.           |  | R/S |                 | R/S |
.           |   -----                   -----
.           |     |                       |
.           |     -                       -
.           |    GND                     GND
.           |
.           |
.           |
.           +-----------------------------------+
.                                               |
.                   Vdd                         |
.                     |                         |
.                     |                         |
.                     +-----+       HEF4538B    |
.                     |     |                   |
.                     |     |       ---OS1---   |
.                    |o     |      |__       |  |
.                   -|      +------|I0       |  |
.                    |o     |      |        Q|  |  3 SECS
.                     |     |      |         |  | -      -
.                     +------------|I1       |  |  |    |
.                     |     |      |        _|  |   ____
.                   [10K]   |      |        Q|--+
.                     |     |      |__       |
.                    GND    +------|CD       |
.                           |      |         |
.                         [1M]     |         |
.                           +------|RT     CT|-+
.                           |      |         | |
.                           |       ---------  |
.                           |        +         |
.                           +---------||-------+
.                                3.3U TANTALUM
.
.
.
.                DIODE OR OUTPUT  TO 4066 RSTs AS INDICATED
.
.
.
.
.         Q,FF1 --|>|--+->33RPM RST    Q,FF1 --|>|--+->45RPM RST
.                      |    4066                    |     4066
.                      |               _            |
.         Q,FF2 --|>|--+               Q,FF2 --|>|--+
.                      |                            |
.                    [10K]                        [10K]
.                      |                            |
.                     GND                          GND
.

You want the button to still be held or transition is disallowed- so that dual one-shot circuit must be modified like so:
View in a fixed-width font such as Courier.


..
..
..
..           +-----------+------------------------------> OFF TO
..           |    FF1    |                FF2             4066 RSTs
..           |  ON/OFF   | <-CD4013->    33/45
..           |           |            +-----------+
..           |   -----   |  1=OFF     |  -----    |
..           |  |     |  |  0=ON      | |     |   |
..           +--|D   Q|  |            +-|D   Q|---|-----> 33RPM
..              |     |  |              |     |   |            4066
..              |    _|  |              |    _|   |             RSTs
..           +-->CK  Q|--+-------------->CK  Q|---+-----> 45RPM
..           |  |     |                 |     |
..           |  | R/S |                 | R/S |
..           |   -----                   -----
..           |     |                       |
..           |     -                       -
..           |    GND       100MS         GND
..           |              -   -
..           |               | |
..           |                _
..           +---------------------------------------------------+
.. Vdd                                                           |
..   |                                                           |
..   +-------+--------------------------------+                  |
..   |       |                                |                  |
..   |   +---|--------------------+           |                  |
..   |   |   |                    |           |                  |
..   |   |   |       ---OS1---    |           |       ---OS2---  |
..  |o   |   |      |__       |   |           |      |__       | |
.. -|    |   +------|I0      Q|----------------------|I0       | |
..  |o   |   |      |         |   |           |      |        Q| |
..   |   |   |      |        _|   |           |      |         | |
..   +---+----------|I1      Q|   |      +----|------|I1       | |
..   |       |      |         |   |      |    |      |        _| |
..   |       |      |         |   |      |    |      |        Q|-+
..   |       |      |__       |   |      |    |      |__       |
..   |       +------|CD       |   +-----------|------|CD       |
..   |       |      |         |          |    |      |         |
.. [10K]   [1M]     |         |          |   1M]     |         |
..   |       +------|RT     CT|-+        |    +------|RT     CT|-+
..   |       |      |         | |        |    |      |         | |
..   |       |       ---------  |        |    |       ---------  |
..   |       |        +         |        |    |                  |
..   |       +---------||-------+        |    +---------||-------+
..   |            3.3U TANTALUM          |             0.1U
..   +-----------------------------------+
..   |
..  GND                          <- HEF4538B ->
..
..
..        DIODE OR OUTPUT  TO 4066 RSTs AS INDICATED
..
..
.. Q,FF1 --|>|--+->33RPM RST    Q,FF1 --|>|--+->45RPM RST
..              |    4066                    |     4066
..              |               _            |
.. Q,FF2 --|>|--+               Q,FF2 --|>|--+
..              |                            |
..            [10K]                        [10K]
..              |                            |
..             GND                          GND
..
..
..
..
..
..
..
..
..



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