DT108 SimmStick Video
26-Jan-2008
Sorry,
we haven't see the STV5730A OSD video chip for a number of years now, so
please don't ask us for them.
We
have no alternative.
We
do have some blank DT108 boards left, that we are selling at a special
price.
18-Nov-2003 5 Channel DT108 project
First a few words about the availability
of the STV5730A OSD video chip:
thomas.didomenico at st.com wrote:
The STV5730A is being obsoleted. Contact Laura Kuosmanen(laura.kuosmanen
at st.com) for details.
Best Regards, STMicroelectronics
27-Jul-2001 The STV5730A
OSD chip is about to become obsolete:
Information kindly supplied
by Simon Blake of The BlackBoxCamera Company Ltd.
We became aware of the situation
recently. We have been advised that November is last orders meaning
that delivery can be scheduled into next year for account customers.
We have not decided on a replacement, but there will definitely be no replacement
from ST. See the notice at http://www.wbc-europe.com/pcn
As such, when current stocks
of the Dontronics DT108 board are sold, there will be no immediate replacement.
Some
useful tips on soldering hese surface mount devices.
"Now, video output is as simple as a PRINT statement!"
Start construction by mounting the video chip. This can be held in place with a drop of glue underneath. Check, double-check, and triple-check that the chip is correctly oriented and lined up with the solder pads before soldering. Once the chip is soldered it will be next to impossible to remove without damaging the PCB or the chip. Use a fine-tip soldering iron, and fine (0.2mm) solder to prevent solder-bridges. If these occur they can be removed with wick or a solder-sucker. The rest of the construction should be done with normal thickness (>1mm) solder.
Next, mount the rest of the components for the main video circuit, shown in RED on the colour-coded overlay. The component values are also shown on the PCB overlay for ease of construction. The resistor marked Rx is not currently used and should not be fitted. Leave the RCA video sockets for last. Note: Although several types of RCA socket will fit on the PCB footprint, the pinouts vary and some will not work. The sockets used in the prototype were obtained from St. Lucia Electronics in Brisbane, Australia. Farnell also appears to have a suitable type (cat# 152-396).
The onboard 5V regulator is only necessary if using the Simmstick video without a powered motherboard. If required, mount the components shown in PURPLE.
Mount the microcontroller components, shown in GREEN, if the serial interface is required. The micro can be an AT89Cx051 or AVR type. It is recommended that the micro is mounted in a socket so it can be removed and reprogrammed, if necessary. Currently the software has only been implemented using BASCOM-8051, although with a little modification it should work with the AVR. Fit the components shown in BLUE if using RS232. Software is currently configured for 9600 baud.
Lionel...
JP1 : Close if using onboard regulator *** If fitting links for RX and TX, leave SI and SO open *** RX, TX : Fit links vertically for RX and TX on standard simmbus pins Fit links horizontally to reverse RX and TX *** If fitting links for SI and SO, leave RX and TX open *** SI, SO : Fit links vertically for SI and SO on standard simmbus pins Fit links horizontally to reverse SI and SO *** Leave CLK, CSN and DAT open if using with onboard micro *** CLK : Serial clock signal for OSD chip. Can be connected to D0-D15 as required CSN : Chip select signal for OSD chip. Can be connected to D0-D15 as required DAT : Serial data signal for OSD chip. Can be connected to D0-D15 as required JP6 : Fit in right-hand position for 89Cx051 : Fit in left-hand position for AVR JP7 : Leave open (not yet implemented) JP8 : Leave open (not yet implemented) JP9 : Leave open for PAL, close for NTSC
PARTS LIST FOR MAIN VIDEO CIRCUIT(RED) Part Type Designator Footprint Description 68nF C7 RAD-0.2 Capacitor 220pF C8 RAD-0.2 Capacitor .1uF C9 RAD-0.1 Capacitor 33pF C10 RAD-0.1 Capacitor 33pF C11 RAD-0.1 Capacitor .22uF C12 RAD-0.2 Capacitor .22uF C13 RAD-0.2 Capacitor 2.2uF C14 Tantalum Capacitor 75 R5 AXIAL0.4 Resistor 5k6 R6 AXIAL0.4 Resistor 2k2 R7 AXIAL0.4 Resistor 75 R9 AXIAL0.4 Resistor 180 R10 AXIAL0.4 Resistor 10uH L1 AXIAL0.4 RF choke 17.734MHz Y2 XTAL-1 Crystal (14.31818MHz for NTSC) PN2222 Q2 NPN transistor STV5730A U2 SOL-28 STV5730A OSD chip RCA socket J1 RCA PCB mount RCA socket J2 RCA PCB mount PARTS LIST FOR OPTIONAL 5V REGULATOR (PURPLE) .1uF C4 RAD-0.1 Capacitor .1uF C5 RAD-0.1 Capacitor 78L05 U3 78L05 regulator PARTS LIST FOR OPTIONAL MICRO (GREEN) 33pF C1 RAD-0.1 Capacitor 33pF C2 RAD-0.1 Capacitor 4.7uF C3 Tantalum Capacitor .1uF C6 RAD-0.1 Capacitor 10k R1 AXIAL0.4 Resistor 10k R2 AXIAL0.4 Resistor 10k R3 AXIAL0.4 Resistor 10k R4 AXIAL0.4 Resistor 10k R11 AXIAL0.4 Resistor 10k R12 AXIAL0.4 Resistor 24MHz Y1 XTAL-1 Crystal BC558 Q1 PNP transistor ATMEL MICRO U1 DIP-20 AT89Cx051 or AVR PARTS LIST FOR OPTIONAL RS232 INTERFACE (BLUE) 1uF C17 Tantalum Capacitor 1uF C18 Tantalum Capacitor 1uF C15 Tantalum Capacitor 1uF C16 Tantalum Capacitor MAX232 U4 DIP-16 RS-232 transceiver chip
A few additional notes from Lionel 18-Oct-2000
There are a few places where they can be bought: Mouser and Nu Horizons
in the USA sell them fairly cheaply but only sell in quantity. Future/Active
apparently sell singles, but are much dearer. In Australia you can get
the chips in singles from RCS Radio. Dick Smith also sells a kit which
contains the chip, so you can probably get it through them as a spare part.
I've heard that you can also get them through Braemac, but I haven't comfirmed
this.
The other tricky parts are the RCA sockets. Unfortunately there are types which will fit in the footprint, but are the wrong pinout (Don't use the ones Dick Smith sells). The ones I used were from St Lucia Electronics in Brisbane, but looking through the Farnell catalog it looks like they sell a suitable type (cat# 152-396). The middle pin (NOT the outer pins) must be connected to the shield.
It would probably be a good idea to sell a short form kit with the PCB,
video chip, and the RCA sockets, as well as a length of .2mm solder for
soldering the video chip.
Subject: Re: Smpte module
Date: Tue, 18
Nov 2003 07:26:28 +1100
From: Ingmar Meins
ingmar_meins at iprimus.com.au
I thought you might like to share it as yet another working simmstick project. I could not get Lionel's original SSAU2000 project to work no matter what I tried. The decoder was flaky and the software would not even decode a perfectly clean stream of stmpte data from a generator so I rebuilt the decoder and rewrote the software. Works like a charm now. Almost drove me nuts till I put a logic analyser and cro on it to prove it wasn't me !
As for the DT108(s) I increased the timing delays slightly, and they all now start reliably which again they would not do with his software. I have also updated it to automatically reset the video mode if the video mute changes state, i.e. no signal, go to stand alone, signal comes back switch to overlay.
I love this stuff. Thanks again for the point of contact. Maybe there will be more somewhere out there.
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