D10 Bluetooth-compatible 5.0 Subwoofer Digital Power Amplifier Board mod

Title as per the ebay ads ;-)

Useful mains/DC powered board - bluetooth, mp3 from USB, line in and 2x mic in with echo ;-) The amp chip is unlaballed, but seems to be some kimnd of class D amp. The internal mains PSU provides around 19v; the DC input suggests 12-24v. (worth noting that the small version of this board, labelled 'Hifi Bass Bluetooth Amplifier Board Mini 12V 240V Stereo Subwoofer With BT' AMP-5M-C, uses half of a standard car radio stereo amp chip and only manages about 7W; this seems to have a bit more poke) The Bluetooth is the main problem though - a loud audible message on power up saying 'bluetooth mode' unless the volume is right down, and of course if connected to a phone as a portable speaker, then if in use as an instrument amp and you get a messag on your phone... I wanted to still use the board as an mp3 player, built into a speaker, but also as a small bass amp. My small rubber string bass has a preamp anyway, so just needs to go straight into to amp module. The unit has two boards - power supply & amp, and the music generation board. I was able to identify the cable carrying analogue audio between the two - the centre connection of the five pin connector on the music board (CN2 by the USB socket). Although only four pins are used, it's a useful way of identifying the cable.

I cut this wire, and extended both halves.

I isolated the first mic input socket (leaving the second one connected) and used it as a break/insert jack; leaving the board connected when unplugged, but when connected disconnects the music board output and replaces it with whatever's on the jack lead.

I disconnected the resistor that mixes the two socket outputs together, and then cut the PCB copper to isolate the normally closed contact on the socket (switches to earth when no mic connected). The music board output was connected to that, and the feed to the amp board connected to the tip connection. I then reassembled the unit and tested it. Before fitting the two mic sockest though, I put read tape over the hole for the new input jack and cut the hole through, to make it clear it is the new 'break' jack.

 https://www.hse.gov.uk/pubns/mines06.pdf

http://www.ingr.co.uk/sar_construction.html

Walks

fisheries loop, there are some footpaths across mynydd cerrig hill too

 

i like this route onto mynydd but follow the track as the footpath is very boggy

 

follow the track then take the first right footpath, the first right track leads to a house as does the track if you follow it all the way. Follow the middle footpath keep going up till u find the trig point

 

  
 

8 pin mini DIN

 https://www.retrorgb.com/retro-gaming-cables-now-offering-8pin-minidin-scart-cables.html

https://etim.net.au/nesrgb/rgb_connector.htm

https://wiki.nottinghack.org.uk/wiki/Raspberry_Pi_Small_LCD

http://www.neo-geo.com/forums/showthread.php?244946-Question-Regarding-the-NeoGeo-Aes-AV-pinout-to-Framemeister

https://www.amazon.ca/Component-Video-Audio-Output-Adapter/dp/B071NLCZDB

https://www.slideshare.net/degarden/electronics-computing-all-connectors

http://www.eightbitclone.com/just.html

PB G3/3400 power plug

from http://pinoutsguide.com/Power/apple_tibookpower_pinout.shtml

Also Suitable for iBook G3 iBook G4 PowerBook G4 NB:PowerBook G3 and iBook Clamshell Require 3.5mm Jack

Basic version of Apple power connector
Works without the internal LEDs or the outer sleeve. The basis of the connector is a 2.5mm (yes 2.5mm, not 3.5mm) male jack. Functioning 100%, including charging the battery.
 

power adapter cable Pin	Name	Direction	Description
1 (left)	sense		400KOhm to GND
2 (right)	GND		Ground
3 (ground)	Vin	<-- td="">	+24V power

Only numbers are taking in account at drawing.
Correction for Powerbook G3 and Clamshell Notebook (3.5 mm jack): Tip (1 = front-most connector) is _NOT_ connected. Ring (2 = middle connector) is the common lead (minus polarity). The sleeve (3) is connected to +24V, this is the inner (hot) wire (with white insulation) of the original G3 (yo-yo type) power adaptor.
Also there is a supply for the loading indicator LED _within_ the plug. A resistor from +24V to the outer 9.5mm tube around the power plug.

Made mainly using Wills materials, with coarse stone walls and corrugated iron roof sheets. Dornaplas windows - Glazed.

Structure is fully painted and weathered, ready to place on your layout.

(Loco shown in photos is for scale purposes only - not included)

Dimensions: Whole building at widest points: approx 140mm long x 120mm wide 

Main shed: 125mm long x 82mm wide (internal).

Office lean to: 53mm x 35mm

Door: 32mm wide x 47mm high.

http://www.ebay.co.uk/itm/ENGINE-SHED-AND-WORKSHOP-009-SCALE-/301762407470?hash=item464270ec2e

U-20

files http://www.synthzone.com/midi/roland/u20/

Roland U-20 Initializing – Restoring the Factory Settings

• Article #1707348
• Added on Mar 20, 2012 at 3:11 PM

The following procedure can be used to clear the internal memory and reload some of the factory settings:
(CAUTION: All USER information will be lost. Be sure to back up any information you wish to keep.)
Original factory data for the U-20 must be loaded in via MIDI or a memory card. There is, however, a memory clearing function that returns most of the other parameters to their original factory settings. Use the following procedure to initialize the U-20:
1. Press PART and RHYTHM simultaneously to enter ROM play mode.
2. While holding MARK and JUMP, press ENTER to enter Test mode.
3. While holding JUMP, press NUMBER 7.
4. Press ENTER.
5. Press VALUE [^] to confirm.
6. While holding MARK and JUMP, press EXIT to exit Test mode.
Note: See “Loading System Exclusive Data” for the procedure to load the factory data through MIDI.

Roland U-20 Loading System Exclusive Data

• Article #1707349
• Added on Mar 20, 2012 at 3:11 PM

Many MIDI devices allow you to store and retrieve data via MIDI system exclusive messages. For example, all the factory settings can be loaded back into the U-20 using this method. Use the following procedure to setup the U-20 to receive system exclusive data:
1. Press EDIT.
2. CURSOR to “Setup” and press ENTER.
3. CURSOR to “MIDI” and press ENTER.
4. CURSOR to “Common” and press ENTER.
5. CURSOR to “RX SysEx =” and use the VALUE buttons to select “On.”
6. CURSOR to “SysEx Device ID = “ and use the VALUE buttons to choose “17.”
7. Press KEYBOARD and SOUND simultaneously and then begin sending the MIDI system exclusive data from your sequencer.

http://www.sysexdb.com/synth_detail.aspx?dv=92