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Commode diode

W

Wayne Lundberg

Jan 1, 1970
0
I'm looking for a schematic for a commode-diode, a device I can put between
the battery connections on my little portable radio at my workstation where
I can push a button that will trigger a normally open relay for one minute
that will turn off my radio for one minute during commercials, and another
push of the button for another minute of silence while listening to Rush or
any other program and silence the commercials.

I can solder a circuit but don't know beans about designing such a system.
I'm thinking of a 555 with variable resistor to time the off function from
one minute to two or three minutes.

I'll build one if you provide the schematic and if it works I will publish
the results here in the newsgroup and give you full credit for the
invention. I'll even take a picture of the final device and make it
available for anybody to see.

Anybody interested?

Wayne in Chula Vista
 
W

Wayne Lundberg

Jan 1, 1970
0
As an alternative to this idea, is there a way to send a signal via the
computer to do the same? I'm using Windows 98 and have the standard IO's.
Any ideas?
 
F

Fleetie

Jan 1, 1970
0
Wayne Lundberg said:
I'm looking for a schematic for a commode-diode

What? You wanna make sure the shit goes down the bog, but can't
travel back up in the opposite direction to spray on your butt
again? A "commode diode".


Martin
 
W

Wayne Lundberg

Jan 1, 1970
0
You got it!


Fleetie said:
What? You wanna make sure the shit goes down the bog, but can't
travel back up in the opposite direction to spray on your butt
again? A "commode diode".


Martin
 
W

Watson A.Name - 'Watt Sun'

Jan 1, 1970
0
I'm looking for a schematic for a commode-diode, a device I can put between
the battery connections on my little portable radio at my workstation where
I can push a button that will trigger a normally open relay for one minute
that will turn off my radio for one minute during commercials, and another
push of the button for another minute of silence while listening to Rush or
any other program and silence the commercials.

I can solder a circuit but don't know beans about designing such a system.
I'm thinking of a 555 with variable resistor to time the off function from
one minute to two or three minutes.

I'll build one if you provide the schematic and if it works I will publish
the results here in the newsgroup and give you full credit for the
invention. I'll even take a picture of the final device and make it
available for anybody to see.

Anybody interested?

Wayne in Chula Vista

Hi, there Wayne down in Chula Vista, I'm up here in Santa Banana, down
the road from Dizzyland. Here's what I did to kill the commercials.
I built a 555 timer and a RF oscillator that I tuned to the FM station
so that when the timer turns it on, it just blots out the audio and
all I hear is a dead silence. It's easily made, and will work okay if
it's close to the radio. C6 may be hard to find, so use a 22 pF and
add a few pF or else a larger coil with more turns to lower the freq.
You can also use an inch or two of solid telephone wire tightly
twisted together to make a 'gimmick' capacitor that you can then trim
to get the right freq. Just solder it across the 22 pF.

ASCII Schematic is viewable with courier font.
--------------------------------

Commercial Killer Circuit
by Watson A.Name 5-14-99 rev 990531e
An ASCII Schematic - view with Courier font
+3V Batt B1
+-----+---+----------------------------------------+-->
| | | C1 |
| | ----- 0.1 uF |
| | ----- \ R3
| | | +-------+----------------------+ / 470k
| | --- | | | \
| | GND | | +------+ C2 | /
| | | | | | .01 | |
| |8| |7| |6| |5| ----- uF | +--+'Time'
| ----------------------------- ----- | | | SW
| | | | | R4 \ | SPDT
| | U1 | --- | 470 / | Cen-
| | | GND | k \ | ter
| | TLC555 | | / O off
R1 \ | (R-S 276-1718) | +3V | | <--+
100 / | | -+- | +--O |
k \ | | | | | |
/ ----------------------------- \ R2 | R5 \ |
| |1| |2| |3| |4| / 100k | 1M / |
| | | | | \ | \ |
| | | | | / | / |
| --- | | | | | | |
| GND | | +-----+ +-----+------+
+-------------+ | PB2 | C3 + |
| | Push O | 47 uF -----
PB1 O | | Button |- 16V -----
Push Button |-- | Reset O | Elec- |
Switch O | | | tro- |
Trigger | | --- lytic |
--- | GND ---
GND | GND
|
+--------+----------+-----+---------+------------+
| | | | |
| | L1 | | | C9
| | 4 turns 3 | / C6 ----- .01
| | 20 gage 3 ----/ Var ----- uF
| | on 1/4" 3 --/-- Cap | Cer-
| \ soda 3 / | 5 to --- amic
| / R6 straw | | 50 pF GND
----- C4 \ 6.8k +---------+
----- / | |
| .001 | Q1 NPN / |
| uF | 2N3904 | / | C7
| | | ----- 6.8
+--------+-----------| ----- pF
| | | \ |
| | | E \ |
| | | |
----- C5 \ +---------+
----- / R7 | |
| .001 \ 4.7k R8 \ | C8
| uF / 470 / ----- 4.7
| | ohm \ ----- pF
| | / |
| | | |
+--------+----------------+---------+
|
---
GND

Legend: ) = No Connection
+ = Connection
GND = Ground or common
Cer.= Ceramic Capacitor
All resistors are 1/4 W 5%.
All capacitors are 16V or more.

The coil serves as the antenna, radiating the RF adequately.

Note: The capacitors across the L1 should be a negative temperature
coefficient to compensate for temperature changes. So the capacitor
should be N750 or more for best performance.

Parts List

B1 Battery, two 1.5V AA cells in a battery holder (270-382)
C1 0.1uF 50V Ceramic
C2 0.01uF 50V Ceramic
C3 .001uF 50V or more Ceramic
C4 .001uF 50V or more Ceramic (optional, not needed)
C5 .001uF 50V or more Ceramic
C6 6-50 pF variable 'green' capacitor (was R-S 272-1340)
C7 6.8 pF Ceramic (see note below)
C8 4.7 pF Ceramic (see note below)
C9 0.01 uF 50V or more Ceramic
L1 4-1/2 T #22 AWG on 1/4 in coil. See note
PB1, Radio Shack 275-1571 Submini Momentary Push Button Switches(2)
PB2 Use red one for trigger, black one for reset.
Q1 2N3904 NPN VHF oscillator transistor (R-S 276-2016)
R1,R2 100K 5% 1/4W
R3,R4 470K 5% 1/4W
R5 1M 5% 1/4W
R6 6.8K 5% 1/4W (or two 3.3k in series)
R7 4.7k 5% 1/4W
R8 470 ohm 5% 1/4W
SW SPDT center off mini switch (R-S 275-325) or equiv.
U1 TLC555 (R-S 276-1718) also 8-Pin socket
Misc: R-S 276-148 PC board, predrilled
Battery Clip

Note: R-S 272-806 Low-pF Ceramic Capacitor Assortment (50)
The coil is made by winding the turns around a piece of soda straw and
then securing it with a drop of candlewax.



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W

Wayne Lundberg

Jan 1, 1970
0
Wow! Thanks - Don't know when I can get to it, but the project is now on my
'to do' list.

Wayne
 
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