From steve at bendentech.co.uk  Sun Apr 16 22:05:20 2023
From: steve at bendentech.co.uk (Steve Lenham)
Date: Sun, 16 Apr 2023 21:05:20 +0100
Subject: [sdiy-market] [FS] Trevor Page TR9090 TR909 clone PCBs and ROMs (UK
 but will ship)
Message-ID: <e1ee970b-bb27-97db-af6f-8e709583f99a@bendentech.co.uk>

Hi,

An exciting change of priorities leaves me with many items looking for 
new homes :-)

On offer here are the two PCBs, pre-programmed PIC and three EPROMs 
(i.e. all the "custom" parts) for building Trevor Page's TR9090 drum 
machine. This was one of the first TR909 clones and, I believe, 
replicates the circuitry faithfully but omits the sequencer. Most of the 
other parts are standard unless you are particularly finicky about the 
VCA, in which case there are a couple of specific transistors to hunt down.

I thought it was a brilliant idea to build one of these and then 
conspicuously failed to do so. All I managed to achieve was to fit and 
beautifully solder the 100K resistors - you can do better than that!

I have all the latest documentation available to pass on.

Asking GBP50 plus postage at cost to wherever you are. Payment by bank 
transfer or Wise preferred - can also take PayPal but with a surcharge 
to cover their ridiculous fees.

If you really want a head start then I think I also have some of the 
bulk components (TL072s, transistors) required - please ask.

Thanks for looking. Happy to answer any questions. More to come!

Cheers,

Steve L.
Benden Technology
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From steve at bendentech.co.uk  Sun Apr 16 22:36:45 2023
From: steve at bendentech.co.uk (Steve Lenham)
Date: Sun, 16 Apr 2023 21:36:45 +0100
Subject: [sdiy-market] [For Sale] Trevor Page TR9090 TR909 clone PCBs and
 ROMs (UK but will ship)
In-Reply-To: <e1ee970b-bb27-97db-af6f-8e709583f99a@bendentech.co.uk>
References: <e1ee970b-bb27-97db-af6f-8e709583f99a@bendentech.co.uk>
Message-ID: <30de3228-637f-625d-4260-f6d1a9ef56c9@bendentech.co.uk>

(Resending as previous photo was way too large for list - oops)

Hi,

An exciting change of priorities leaves me with many items looking for 
new homes :-)

On offer here are the two PCBs, pre-programmed PIC and three EPROMs 
(i.e. all the "custom" parts) for building Trevor Page's TR9090 drum 
machine. This was one of the first TR909 clones and, I believe, 
replicates the circuitry faithfully but omits the sequencer. Most of the 
other parts are standard unless you are particularly finicky about the 
VCA, in which case there are a couple of specific transistors to hunt down.

I thought it was a brilliant idea to build one of these and then 
conspicuously failed to do so. All I managed to achieve was to fit and 
beautifully solder the 100K resistors - you can do better than that!

I have all the latest documentation available to pass on.

Asking GBP50 plus postage at cost to wherever you are. Payment by bank 
transfer or Wise preferred - can also take PayPal but with a surcharge 
to cover their ridiculous fees.

If you really want a head start then I think I also have some of the 
bulk components (TL072s, transistors) required - please ask.

Thanks for looking. Happy to answer any questions. More to come!

Cheers,

Steve L.
Benden Technology

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From ben at stuyts.nl  Tue Apr 18 16:51:31 2023
From: ben at stuyts.nl (Ben Stuyts)
Date: Tue, 18 Apr 2023 16:51:31 +0200
Subject: [sdiy-market] Test, please ignore
Message-ID: <711A68DB-86AB-4E5D-9D5C-C09E45AD421F@stuyts.nl>

Admin testing here.


From steve at bendentech.co.uk  Sun Apr 16 23:01:25 2023
From: steve at bendentech.co.uk (Steve Lenham)
Date: Sun, 16 Apr 2023 22:01:25 +0100
Subject: [sdiy-market] [For Sale] ETI Transcendent2000 restoration project
 (UK but will ship)
Message-ID: <a75c00b1-998c-cc5c-2bda-2824326a639a@bendentech.co.uk>

Hi,

What we have here are the two PCBs (large main synth board plus 
dual-rail power supply board) from the eternally-popular ETI/Powertran 
Transcendent2000 monosynth. This was a successful starter synth design 
that was originally published in ETI magazine as well as sold in kit 
form. It has all the basic features one would expect plus the advantage 
of being constructed using no exotic components, this making it very 
DIY-friendly (though CA3046s, LM3080s and PTH tempco resistors are sadly 
not as run-of-the-mill as they used to be...).

The original build documentation is widely available online and complete 
instruments regularly come up for sale.

I bought these boards some years ago with the intention of...blah blah 
blah - you know the rest. They are in fairly shabby condition and should 
be considered a restoration project, but not one which should be too 
challenging. All that needs to be added to make a complete synth is a 
mains transformer, some casework and a keybed (not even that if it is 
built up as a module, though be warned that the board is too long to 
rack-mount).

Asking GBP75 plus postage at cost to wherever you are. Payment by bank 
transfer or Wise preferred - can also take PayPal but with a surcharge 
to cover their ridiculous fees.

Thanks for looking. Happy to answer any questions or send more photos. 
More to come!

Cheers,

Steve L.
Benden Technology

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From steve at bendentech.co.uk  Sat Apr 22 16:35:21 2023
From: steve at bendentech.co.uk (Steve Lenham)
Date: Sat, 22 Apr 2023 15:35:21 +0100
Subject: [sdiy-market] [SOLD] ETI Transcendent2000 restoration project (UK
 but will ship)
In-Reply-To: <a75c00b1-998c-cc5c-2bda-2824326a639a@bendentech.co.uk>
References: <a75c00b1-998c-cc5c-2bda-2824326a639a@bendentech.co.uk>
Message-ID: <ef0d0e76-d6fc-be01-5868-94d49e04a71e@bendentech.co.uk>

Hi,

Transcendent2000 boards have been sold. TR9090 boards still available 
and more stuff coming...

Cheers,

Steve L.

On 16/04/2023 22:01, Steve Lenham wrote:
>
> Hi,
>
> What we have here are the two PCBs (large main synth board plus 
> dual-rail power supply board) from the eternally-popular ETI/Powertran 
> Transcendent2000 monosynth. This was a successful starter synth design 
> that was originally published in ETI magazine as well as sold in kit 
> form. It has all the basic features one would expect plus the 
> advantage of being constructed using no exotic components, this making 
> it very DIY-friendly (though CA3046s, LM3080s and PTH tempco resistors 
> are sadly not as run-of-the-mill as they used to be...).
>
> The original build documentation is widely available online and 
> complete instruments regularly come up for sale.
>
> I bought these boards some years ago with the intention of...blah blah 
> blah - you know the rest. They are in fairly shabby condition and 
> should be considered a restoration project, but not one which should 
> be too challenging. All that needs to be added to make a complete 
> synth is a mains transformer, some casework and a keybed (not even 
> that if it is built up as a module, though be warned that the board is 
> too long to rack-mount).
>
> Asking GBP75 plus postage at cost to wherever you are. Payment by bank 
> transfer or Wise preferred - can also take PayPal but with a surcharge 
> to cover their ridiculous fees.
>
> Thanks for looking. Happy to answer any questions or send more photos. 
> More to come!
>
> Cheers,
>
> Steve L.
> Benden Technology
>
>
>
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From steve at bendentech.co.uk  Wed Apr 26 16:11:24 2023
From: steve at bendentech.co.uk (Steve Lenham)
Date: Wed, 26 Apr 2023 15:11:24 +0100
Subject: [sdiy-market] [FOR SALE] Development boards: EPROM, audio amp, USB,
 CPLD (UK but will ship)
Message-ID: <f10aea0e-1498-78f1-a227-b3df1b2830bb@bendentech.co.uk>

Hi,

Read on for the next set of stuff off the top of the pile looking for a 
new home! Today: development boards.

Postage at cost to wherever you are. Payment by bank transfer or Wise 
preferred - can also take PayPal but with a surcharge to cover their 
ridiculous fees. If you think my pricing is wrong or would like to buy 
multiple items, get in touch!

Thanks for looking. Happy to answer any questions. More to come!

Cheers,

Steve L.
Benden Technology

1. Willem EPROM programmer (previously posted but unsold - price 
reduced) - asking GBP20.

The Willem programmer was an open-source DIY design that enjoyed many 
iterations and still forms the basis of a lot of the cheap Far Eastern 
programmers. This one was built by my own fair hand using a commercial 
PCB (version 3.1 ATH, if you are Googling) and I used it for many years 
before upgrading. Plenty of information is still available online 
including the driver software.

Settings are made manually using jumpers and DIP switches, which means 
you need to be careful but also makes it a very versatile device, 
capable of programming all sorts of things (EPROM, EEPROM, FLASH, 
micros, etc.). Communication with the host PC is via the old-school 
parallel port (and it needs to be a "real" one).

This one comes with a couple of adaptors that are particularly useful 
for vintage synths:

- Adaptor for 2716 and 2732 EPROMs. The Willem handles larger EPROMs 
directly but needs a pin adaptor for these. This is what I used most.

- Adaptor for reading and writing Intel MCS-48 microcontrollers. This 
will read mask-ROM 8048/49s as found in a lot of early Roland synths and 
program the EPROM equivalents (8748/49).

Willem programmer

Overall, a very useful device if you are willing to get a bit "hands-on" 
- which hopefully everyone here is :-)

2. Tripath EB-TA2020 evaluation board for TA2020 2x20W Class-T amplifier 
- asking GBP15.

Tripath were one of the pioneers of switching audio amplifiers and made 
some very nice-sounding devices before, I believe, going bust! This is 
an evaluation board for their then-popular TA2020 device and can 
effectively be viewed as a small (10cm x 6cm) stereo amplifier module 
delivering 20W/channel into 4 ohms from a 13.5V supply. Input is via 
phono connectors and there are banana sockets for power and outputs. 
Comes with datasheets for device and board. This was briefly used for 
evaluation then stowed away.

3. DLP-245PB USB/PIC microcontroller development module - asking GBP10.

This is a little plug-in (DIL) module containing a PIC16F877 micro and 
an FTDI FT245 USB interface, i.e. everything required to implement a 
basic piece of USB hardware. The manufacturers (DLP Design) provide USB 
drivers and example code, so it is a really easy way in to USB. Not sure 
if I ever actually used this - don't remember doing so, so it is 
basically untouched :-)

See https://www.dlpdesign.com/usb/245pb.shtml for more details.


4. Elektor Altera MAX CPLD programmer/development board plus parallel 
JTAG interface - asking GBP20.

This is a development board for the Altera MAX7000 family of CPLDs, 
specifically the EPM7128. It was published in Elektor magazine back in 
2004 alongside a multipart tutorial in the subject and I built one 
carefully using one of their PCBs before doing precisely nothing with 
it. It has never even been powered up. Comes with a matching Elektor 
parallel port JTAG interface, but there is no reason why a more modern 
USB JTAG port (not supplied) couldn't be used.

I can supply copies of the Elektor build info and tutorials if desired. 
Programming software was Altera's Quartus suite - I don't think I have 
it on file, but it's probably out there on the Web somewhere.
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From steve at bendentech.co.uk  Sat Apr 29 00:29:40 2023
From: steve at bendentech.co.uk (Steve Lenham)
Date: Fri, 28 Apr 2023 23:29:40 +0100
Subject: [sdiy-market] [SOLD] Tripath audio amp - EPROM, USB,
 CPLD devkit still available (UK but will ship)
In-Reply-To: <f10aea0e-1498-78f1-a227-b3df1b2830bb@bendentech.co.uk>
References: <f10aea0e-1498-78f1-a227-b3df1b2830bb@bendentech.co.uk>
Message-ID: <d47d8e56-f35b-1899-b212-88f41381f0b9@bendentech.co.uk>

Tripath evaluation board is sold - thank you.

On 26/04/2023 15:11, Steve Lenham wrote:
>
> Hi,
>
> Read on for the next set of stuff off the top of the pile looking for 
> a new home! Today: development boards.
>
> Postage at cost to wherever you are. Payment by bank transfer or Wise 
> preferred - can also take PayPal but with a surcharge to cover their 
> ridiculous fees. If you think my pricing is wrong or would like to buy 
> multiple items, get in touch!
>
> Thanks for looking. Happy to answer any questions. More to come!
>
> Cheers,
>
> Steve L.
> Benden Technology
>
> 1. Willem EPROM programmer (previously posted but unsold - price 
> reduced) - asking GBP20.
>
> The Willem programmer was an open-source DIY design that enjoyed many 
> iterations and still forms the basis of a lot of the cheap Far Eastern 
> programmers. This one was built by my own fair hand using a commercial 
> PCB (version 3.1 ATH, if you are Googling) and I used it for many 
> years before upgrading. Plenty of information is still available 
> online including the driver software.
>
> Settings are made manually using jumpers and DIP switches, which means 
> you need to be careful but also makes it a very versatile device, 
> capable of programming all sorts of things (EPROM, EEPROM, FLASH, 
> micros, etc.). Communication with the host PC is via the old-school 
> parallel port (and it needs to be a "real" one).
>
> This one comes with a couple of adaptors that are particularly useful 
> for vintage synths:
>
> - Adaptor for 2716 and 2732 EPROMs. The Willem handles larger EPROMs 
> directly but needs a pin adaptor for these. This is what I used most.
>
> - Adaptor for reading and writing Intel MCS-48 microcontrollers. This 
> will read mask-ROM 8048/49s as found in a lot of early Roland synths 
> and program the EPROM equivalents (8748/49).
>
> Willem programmer
>
> Overall, a very useful device if you are willing to get a bit 
> "hands-on" - which hopefully everyone here is :-)
>
> 2. Tripath EB-TA2020 evaluation board for TA2020 2x20W Class-T 
> amplifier - asking GBP15.
>
> Tripath were one of the pioneers of switching audio amplifiers and 
> made some very nice-sounding devices before, I believe, going bust! 
> This is an evaluation board for their then-popular TA2020 device and 
> can effectively be viewed as a small (10cm x 6cm) stereo amplifier 
> module delivering 20W/channel into 4 ohms from a 13.5V supply. Input 
> is via phono connectors and there are banana sockets for power and 
> outputs. Comes with datasheets for device and board. This was briefly 
> used for evaluation then stowed away.
>
> 3. DLP-245PB USB/PIC microcontroller development module - asking GBP10.
>
> This is a little plug-in (DIL) module containing a PIC16F877 micro and 
> an FTDI FT245 USB interface, i.e. everything required to implement a 
> basic piece of USB hardware. The manufacturers (DLP Design) provide 
> USB drivers and example code, so it is a really easy way in to USB. 
> Not sure if I ever actually used this - don't remember doing so, so it 
> is basically untouched :-)
>
> See https://www.dlpdesign.com/usb/245pb.shtml for more details.
>
>
> 4. Elektor Altera MAX CPLD programmer/development board plus parallel 
> JTAG interface - asking GBP20.
>
> This is a development board for the Altera MAX7000 family of CPLDs, 
> specifically the EPM7128. It was published in Elektor magazine back in 
> 2004 alongside a multipart tutorial in the subject and I built one 
> carefully using one of their PCBs before doing precisely nothing with 
> it. It has never even been powered up. Comes with a matching Elektor 
> parallel port JTAG interface, but there is no reason why a more modern 
> USB JTAG port (not supplied) couldn't be used.
>
> I can supply copies of the Elektor build info and tutorials if 
> desired. Programming software was Altera's Quartus suite - I don't 
> think I have it on file, but it's probably out there on the Web somewhere.
>
>
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