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RCA to Breadboard Adapter (#28050)
The Parallax RCA to Breadboard Adapter makes it convenient to connect an RCA jack to breadboards,
protoboards and perfboards with 1/10-inch hole spacing. Designed with the Propeller Education Kit in
mind, this adapter simplifies connecting the PE Platform’s Propeller Microcontroller to Audio/Video inputs
on televisions and other devices.
Our “...to Breadboard” adapters make connectors breadboard-friendly for prototyping. These adaptors
tend not to feature built-in circuits, just the connector mounted on a PCB and routed to pins. This makes
each adapter more flexible for different applications. Hand wiring the interface circuit also gives students
the opportunity to become more familiar with the relationships between circuits, theory of operation, and
coding principles.
Features
RCA Jack
4 dual-pin DIP board improves
mechanical stability for plugging and
unplugging the peripheral's cable.
Compact board can be oriented across a
breadboard trench lengthwise or
crosswise for flexibility in parts
placement.
1/10” pin spacing for common
breadboard placement
Key Specifications
Supply voltage: N/A
Supply current: N/A
Communication: Depends on peripheral.
Examples include NTSC, PAL, and PWM.
Package: 4 dual-pin DIP, 0.1” spacing
Operating temperature: 0 – 70° C.
Size: (0.87 in H x 0.65 in W x 0.75 in D)
22 mm x 16 mm x 19 mm
Weight: 0.12 oz (3.5 g)
Pin Definitions
SIG
GND
RCA center connection (tip)
RCA outer sleeve (ring)
GND
SIG
The two pins in each pin-pair are electrically
connected to each other; either pin by a
given pin label can be used to make the
electrical connection.
SIG
GND
Copyright © Parallax Inc.
RCA to Breadboard Adapter (#28050)
v1.0 7/11/2008 Page 1 of 4
Dimensions
Dimensions are approximate and subject to minor changes based on component availability.
Test Applications
The next two test applications use the Propeller microcontroller to test baseband video and audio
transmission to a TV set’s video and audio inputs. The Resources and Downloads section has pointers to
lots more audio/video example applications.
Propeller Microcontroller – TV Display with Baseband Video
The RCA to Breadboard Adapter can be used to build the Propeller Demo Board’s 1 V, 75
Ω,
3-bit DAC on
a breadboard. The Propeller Demo Board uses it to generate either broadcast or baseband video. Most
Propeller video objects are written so that the base pin in the schematic gets connected to an I/O pin
that’s a multiple of 4. In the case of the Propeller Demo Board, the base pin is P12, and the successive
DAC bits are P13, P14, and optionally P15.
Propeller Education Kit resistor values of 220
Ω,
470
Ω,
and 1 kΩ can be used in place of the slightly
larger values shown in the schematic with no discernible change in video quality. Also, for baseband
transmission with Test TV Text.spin, the aural subcarrier DAC bit is not required.
Propeller Demo Board Circuit
PE Kit Circuit for Test TV Text.spin
Build the PE Kit Circuit for Test TV Text.spin.
Connect a TV’s video input to the RCA adapter.
Run Test TV Text.spin. This file is included in Test-TV-Text-and-Notes.zip, which is available for
download from the RCA to Breadboard Adapter (#28050) page at www.parallax.com
''File: Test TV Text.spin
''Tests baseband video connection by displaying text message on TV.
CON
_clkmode = xtal1 + pll16x
_xinfreq = 5_000_000
' System clock settings
Copyright © Parallax Inc.
RCA to Breadboard Adapter (#28050)
v1.0 7/11/2008 Page 2 of 4
BASE_PIN = 12
OBJ
tv
: "tv_terminal"
' DAC base pin is P12
' Declare tv_terminal object
PUB start | i
tv.start(BASE_PIN)
tv.str(string("This is a test message..."))
' DAC base pin is P12
' Display message
Propeller Microcontroller – TV Audio Tone
The adapter can also be used to build the Hydra Game System’s audio circuit on a breadboard, providing
audio options for the Propeller microcontroller on a breadboard. The Test TV Notes.spin application uses
duty modulation and the Propeller chip’s ROM sine lookup table to synthesize musical notes.
(Use P8 for Test
TV Notes.spin)
Audio Circuit
Build the audio circuit and use I/O pin P8.
Connect a TV’s audio input to the RCA adapter.
If you have not already done so, download Test-TV-Text-and-Notes.zip from the RCA to
Breadboard Adapter (#28050) page at
www.parallax.com.
Unzip Test-TV-Text-and-Notes.zip, and then open and run Test TV Notes.spin.
''File: Test TV Notes.spin
''Plays audio notes for TV speakers.
CON
_xinfreq = 5_000_000
_clkmode = xtal1 + pll16x
C6 = 1047, D6 = 1175, E6 = 1319, F6 = 1397
G6 = 1568, A6 = 1760, B6 = 1976, C7 = 2093
OBJ
sine : "Sine"
PUB solfege | i, note
repeat i from 0 to 7
note := lookupz(i:C6,D6,E6,F6,G6,A6,B6,C7)
sine.freqout(8, 250, note)
waitcnt(clkfreq/4 + cnt)
'
'
'
'
Loop to play the notes
Use index to look up notes
P8 transmits for 250 ms at f = note
Rest 1/4 s
' Declare Sine Driver object
' System clock settings
' Do, Re, Mi, Fa, Sol, La, Ti, Do
Copyright © Parallax Inc.
RCA to Breadboard Adapter (#28050)
v1.0 7/11/2008 Page 3 of 4
Resources and Downloads
To get to the resources listed in this section, go to
www.parallax.com,
enter the part number into the
Search field, and click the Go button.
The Propeller Education Kit 40-pin DIP and PropStick USB versions are both compatible with these
adapters. The Propeller Education Kit also features tutorials for getting started with the Propeller
Microcontroller.
Propeller Education Kit – 40 Pin DIP version (#32305)
Propeller Education Kit – PropStick USB version (#32306)
There are more audio and video examples in the Propeller Library – Demos folder. These examples
utilize a television display with RCA video and audio inputs, and have been tested on the Parallax Mini
LCD A/V Color Display. This display is also included in the Propeller Accessories Kit along with a Parallax
PS/2 Optical mouse and Mini Keyboard. You can connect a PS/2 mouse and keyaboard to your PE
Platform or other breadboard with the PS/2 to Breadboard Adapter.
Propeller Accessories Kit (#32311)
PS/2 to Breadboard Adapter (#28060)
The display and PS/2 optical mouse and keyboard are also sold separately.
Mini LCD A/V Color Display (#603-3200)
Parallax PS/2 Optical Mouse (#32350)
Parallax PS/2 Mini Keyboard (#32351)
Copyright © Parallax Inc.
RCA to Breadboard Adapter (#28050)
v1.0 7/11/2008 Page 4 of 4
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