Dexter's WorkShop

Professional grade design services. - Schematic design - PCB design - Mechanical design

THE CC SENDER - testing sessions using Reaper DAW
#dextersworkshop #ccsender

Some commissioned work for a friend.
A small extension board for a NodeMCU board.
#dextersworkshop #scoaladerobotica

Late night testing sessions. A new product is to be released.
#dextersworkshop #theccsender

THE CC SENDER is almost ready. A small MIDI utility box that can accept 3 expression pedals and for each expression pedal a MIDI CC number can be assigned and sent over MIDI (to a rack processor unit for example).
Each CC message can be sent on its individual channel (can be freely assigned).
Also the box can accept input from 2 momentary buttons that can be used to send PC messages ( a number of 8 PC messages can be sent, being organized in 4 banks) - so basically you can change presets ...and control you effects parameters real time via a single interface box.

youtube.com

Guitar Pickup vs Cables frequency measurements

Some more experiments, this time with the freq response of a guitar pickup. The frequency response of a guitar pickup using shot and long cables and the influence of the tone control on the frequency response.
Enjoy and as always feedback is highly appreciated.
https://www.youtube.com/watch?v=EVEO-BfyzZk

The frequency response of a guitar pickup using shot and long cables and the influence of the tone control on the frequency response.

THE CC -SENDER - work in progress
#dextersworkshop #theccsender

Ying n' Yang K&C buffers
#kcbuffer #dextersworkshop

Custom color K&C buffer
#kcbuffer #dextersworkshop

#kcbuffer #dextersworkshop

K&C dual buffer. A very small pedal (90x35x30 mm) that houses 2 type of buffers that you can choose via the small switch on the side.
#dextersworkshop #kcbuffer

THE PREAMP

A small classic tube preamp based on a very famous bass preamp (preamp that was inspired by the Fender Dual Showman), with some added features:

– separate gain and volume controls will enable you to enter in the overdrive domain, so you can keep a decent output volume and get that pumped tone.
– high-voltage FET buffer (optional)

The preamp uses an internal SMPS module for the High-Voltage and will need a 12V DC @ 1A wall-wart (provided with the preamp).

The version of the current preamp wi MK1-V2 and comes with the following updated features:

– Input pad (-6db)
– Deep switch
– Bright switch
– High-cut switch
– Output pad 1:10 attenuation

Shop link: http://www.dextersworkshop.com/shop/preamp-full-tube-high-voltage-guitar-bass-preamp/

Integrated Switching System Control
===================================

Technical specifications:
- 8 inputs for switches
- 8 outputs that can supply up to 150mA (each)
- can accept DC or AC as supply voltage (between 6V and 12V DC or AC)
- MIDI IN / OUT / THROUGH (buffered)
- Mute output port for MUTE before switch
- Optional LCD output
- 8 status outputs (can supply LEDs for example)

Configuration specifications:
- For each MIDI PC message can be assigned a combination of active outputs (relays)
- For each of the 8 INPUTS can be assigned a combination of active outputs (relays)
- For each of the 8 INPUTS a maximum of 16 characters name can be assigned (visible on the optional LCD)
- For each of the 8 OUTPUTS can be assigned a MIDI CC number (CC value grater than 0 would activate the output / a CC with a value of 0 would deactivate the output)
- Configurable pre-mute delay and mute delay (each with its own values)
- MIDI channel can be freely configured
- For each of the 8 inputs a MIDI PC message can be assigned to be sent when the input is activated also, a different channel can be assigned for the MIDI PC messages sent by the foot-switches
- In case of not using the MIDI PC send feature, this can be deactivated
- Each of the 8 OUTPUTS can be configured pe be a momentary latch with a custom time between 0 and 255ms (1/4 of a sec)

Utility specifications:
- The ability to erase the board via GUI and reset it to factory defaults
- The ability to save the current configuration of the board
- The ability to restore the saved configuration of the board (for example in case that many boards needs to be configured with the same features)
- Firmware update section - for updating the running firmware of the board or to upload custom firmware (available by request)

All the configuration features are available via a computer GUI (compatible with Windows XP, Windows 7 and Windows 10 / 64 and 32 bits)

Package will be delivered with the control board, programming interface and instructions to download the GUI programming application.

The Black Hand boost.
#dextersworkshop

The IPSS integrated swithing board.
#ipss #dextersworkshop

A small hybrid headphone amplifier ... under construction.

Testing and milling as we prepare some enclosures for some very small guitar preamps.

We are almost done with the redesign of the PCBs.
This time we've finished to prepare "THE GTFO" for production.
Soon to be released in an improved version.

dextersworkshop.com

Shop - DeXTeR's Workshop

After aprox. 4 days of site downtime, we are back online.
We might encounter some glitches with the email (until the DNS will fully propagate) but the website is back.
Thank you for your patience.
http://www.dextersworkshop.com/

dextersworkshop.com FX-LOOP add-on module that can be fitted virtually in any guitar tube amplifier. It's based on 6N17B sub-miniature double triode (military grade tube with over 5000 guaranteed service hours).

There is a big redesign for our most successful product - "THE PREAMP"
Even if we are going to design a totally different product that will be THE PREAMP MK-II (full tube / high voltage bass preamp), we will also keep the MK-I, but as we always said: feedback from our customers and professional musicians is very important, so we decided to redesign MK-I and add some extra features.
Hopefully the first improved MK-I will be available in no more than 2 months from now.

Don't we just love to do panels ... true bypass relay module with soft-switch on the way (EAGLE CAD and GERBview output)

We are in the process of redesigning some of our products and this time is the soft-switch relay module.
A module that can be used in various applications that includes 2 types of bypass for pedals (a type where the input of the effect is grounded on bypass and a classical one).
One of the two configurations can be selected by a small solder jumper from the back of the board (easy as pie).
The PCB design is ready and we are preparing to get this product back on the shop because it was highly appreciated by our customers.
Stay tuned and until then a little bit of sneak and peek.

[08/11/17]   Hello my dear friends and clients.
Starting from the end of this week we will be in the process of migrate our web server and e-mail server and some delays might be expected.
We are trying to finish this process as soon as possible.
In the mean time we can be contacted on FB message system (from this page).
Thank you for your understanding.

Regards,
DeXTeR

We've started to work already on "THE PREAMP MK-II" that will have the following features:
- high / low input for active / passive instruments
- bright switch
- high-cut switch
- deep switch
- pre-gain passive tonestack
- post-gain active 1 band parametric EQ. with 2 freq. interval
- variable HPF filter (20 to 120HZ)
- DI output
- TS output
- switchable level outout (-4 / +10)

Stay tuned ... it will be a nice one and of course it will be full-tube / high voltage! No jokes, no low voltage.

dextersworkshop.com

THE PREAMP – FULL TUBE / HIGH VOLTAGE BASS / GUITAR PREAMP

And another pleased client. Seems like "THE PREAMP" is getting some attention in EU thanks to Felix and Harald...
Link: http://www.dextersworkshop.com/shop/preamp-full-tube-high-voltage-guitar-bass-preamp/

Quote:
"My preamp is violent!
My signal chain is as follows -> Warwick Thumb> Compressor> Dexter> SansampRBI (with BBE-Maximizer in the 50:50 EffectLoop)

With the Compressor I turn down the Signal a little bit.
Then I crank up the Gain from the Dexter-Preamp til the Sound is rich an huge.
With the Sansamp incl. the Maximizer I creat an very agressive metallic Sound in the High Mids.
The Blend in the Sansamp is at about 40% (Main Sound from Dexter)
The Dexter-Preamp Setting: Bass/Mids/Treble 40/80/30 Gain: 60 Vol:around 10-20%
With this I have an huge/fat Sound with an very agressive Top-End.

I also played the Preamp alone with an very old Single-Coil passive Bass and an Dean Freetless.
I think the Preamp is very versatile. Super rich Clean-Sound for every Style of Music.
You can also drive the Tube in a light Overdrive which I like very much."

dextersworkshop.com A small desktop clean preamp based on F2B tube preamp, with some added features: – separate gain and volume controls will enable you to enter in the overdrive domain – high-voltage FET buffer (optional)

Here we go again...another batch of full tube high voltage bass preamps

I just love when I receive this kind of messages in my inbox about my products. This one was received from a client and friend from Germany and he's talking about the full tube bass preamp. He's also an excellent engineer along with the fact that he's also a musician.
Quote:
"Good Morning,
It seems, it depends on style and impedance of the build in or stand allone Preamp what would be used in the Signal chain.
I did also a test using my Mesa Bass Di Preamp.
Results were always very good!
Big difference with on/off bright switch. With bright switch ON, DeX Preamp is working like an enhancer on both settings.
The preamp is useable everywhere. It could also be integrated in send/Return path of all amps, e.g. to enhance the signal.
I use DeX unit straigt in SWR power amp and all sound shaping is done by passive tone stack or the active EQ from the instruments.
DeX's unit is used to produce sweet mids and add/reduced Bass Levels.
Did a test with my 77 Ray. Stunnig sound! Using low gain level, bright cap "off", Mid & Bass pots you can create total sweet pumping sounds. Treble boost can be adjusted from activ EQ of the bass."

ParaBoost - a parametric booster - is getting ready to enter in the test stage.

Dexter's WorkShop's cover photo

"Red Tide" delay - soon to be released

"Red Tide" delay - soon to be released

A new pedal will be added to the already existing family. "Red Tide" delay aims to be an all around delay with a vintage sound (the repeats gets darker as they go).
The pre-order will soon be announced.

A small classic tube preamp based on a very famous bass preamp (preamp that was inspired by the Fender Dual Showman), with some added features:

– separate gain and volume controls will enable you to enter in the overdrive domain, so you can keep a decent output volume and get that pumped tone.
– high-voltage FET buffer (optional)

The preamp uses an internal SMPS module for the High-Voltage and will need a 12V DC @ 1A wall-wart (provided with the preamp).

A small classic tube preamp based on a very famous bass preamp (preamp that was inspired by the Fender Dual Showman), with some added features:

– separate gain and volume controls will enable you to enter in the overdrive domain, so you can keep a decent output volume and get that pumped tone.
– high-voltage FET buffer (optional)

The preamp uses an internal SMPS module for the High-Voltage and will need a 12V DC @ 1A wall-wart (provided with the preamp).

This is a project that i've start to work on ...some very long time ago and i'm thinking on selling the concept / project / code. It's a universal switcher / looper motherboard that can accept input from a maximum of 16 keys / switches and can command up to 24 relays / leds or combinations of. Also can accept and can send MIDI messages for every preset / button.
It's build around ATMEGA328p and it's using 4 x I2C port expanders. Each power section is driven by a ULN2803 driver with pull-up resistors.
Basically you can build any type of switching system around this motherboard.

Another FX-LOOP module fitted in a Fender Bassman 70 by Jussi Saily. Thank you for the pictures.

Another rig pictures day, this time a bass rig that is using "Comrade Preamp" - full tube / high voltage bass pramp by DeXTeR's WorkShop.
Thank you Felix Hubert for the pictures!

Mircea's pedalboard with "Propaganda Booster" - quite a clean job we have here!

Another custom project finished. A switching system for a very fine artist (Dan Houston) that will be used with ... let's say a more unconventional instrument, a chapman stick.
Requests were:
- 2 input and 2 outputs for each section of the instrument
- 5 true-bypass loops
- each loop can be freely assigned to either one section or the other
- inputs on the left and outputs on the right
And there you have it ... no uController / no active electronics - just switches and relays.
A very nice custom project.

DeXTeR's WorkShop on Tone Report

DeXTeR's WorkShop on Tone Report

DeXTeR's WorkShop "GTFO" - full tube / high voltage guitar pedal was published on Tone Report Magazine
http://www.magazine.tonereport.com/ (page 8)

dextersworkshop.com

PROPAGANDA RADIO - BOOSTING YOUR INSPIRATION AND TONE SINCE 2015

After solving some problems and taking some decisions regarding the design, DeXTeR's WorkShop is proud to announce the official release of "Propaganda Radio" - a very nice and transparent guitar booster.
http://www.dextersworkshop.com/shop/propaganda-radio-transparent-guitar-clean-boost/

dextersworkshop.com

Dexter's WorkShop's cover photo

Morning guys. Today i was reading some documentation about... well about the 555 timer (yes i do have a fetish with it ... i really love it).
And among other things i've remembered that ... 555 can be used as a flip-flop circuit... flip-flop you say?
Well that would translate in a very nice application for relay bypass using 555 as a flip-flop circuit and a hardware debounce (with as small cap).
How does it work? Better then the uControler version, faster and ... let's face it much more cheaper (4 x 10k resistors / 1 x 555 / 1 x 220n cap / 1 x 4148 diode and one relay)... ohh another advantage?! Well you can use it from 5 to 15V without the use of any regulation element.
Well... what do ya think ?! (And yes is tested)

[04/12/16]   Ok my dear friends, as i promised, today i'm going to announce the winners of the giveaway, which are:

Iulian Chiculiţă - Nos Injector Booster
Brian Aldrich - Miniamp Kit
Roy Greenhouse - THE GTFO

Please drop me a message so we can discuss the details. More giveaways to come in the near future! Stay tuned!

dextersworkshop.com

MIDI PC (PROGRAM CHANGE) SENDER - DeXTeR's Workshop

I've added another project to the project library. It's quite old and was published on a number of DIY sites. Here it is, a small MIDI controller that will send incremented or decremented PC-MIDI Messages, very handy for changing presets on a effect processor or any other device that accepts Program Change MIDI messages.

http://www.dextersworkshop.com/portfolio/midi-pc-program-change-sender/

dextersworkshop.com A small MIDI controller that will send incremented or decremented PC-MIDI Messages (Program Change messages / 0 to 127) with the following features: – UP / DOWN buttons – for every send message a corespondent led will blink – last … Continued

[04/09/16]   All right ladies and gentlemen, the giveaway campaign it's over. I'm going to announce the winners on 12th or April. Stay tuned!

dextersworkshop.com

DeXTeR's WorkShop - List of provided services

Another section of the site was born - the Services section. It's more of a guide line but i've decided that is better to have one then not to have one.. so here it is.
http://www.dextersworkshop.com/dexters-services/

dextersworkshop.com A list of the main provided services by DeXTeR's WorkShop. Please feel free to contact me for any problem / idea or service requests that you might have. The posted list it's more of a guide line so please feel free to drop me an email or a Skype call.

dextersworkshop.com

PEDAL SWITCHER WITH 4 LOOPS / 8 PRESETS / 2 BANKS AND MIDI IN

Finally i've managed to post this project in DIY community. Firmware and video presentation are posted. Any questions are highly encouraged.

http://www.dextersworkshop.com/portfolio/pedal-switcher-4-loops-8-presets-2-banks-midi/

dextersworkshop.com This project is a switching system for pedals, in which you can insert a maximum number of 4 pedals (or 4 groups of pedals) and you can create presets (combinations of pedals or group of pedals) and recall them with a single button (no more tap-dance).

I've started to design a new model of HV SMPS and this time i'm going to use widely available MC34063 IC (integrated SMPS controller).
The requirements are:
- 12V Input voltage
- Variable Output voltage (max. 300V OUT)
- At least 25mA output current @ max. output voltage
- Switching freq. over 70KHz
- Vripple no more then 100mVpp (it's quite a decent value)
This is the first iteration of the design / tested in a bench environment and it performs quite good.
Because of the high switching freq. the design of the PCB is quite critical.
Also an active pull-down circuit was added for fast discharge of the FET's gate.
I do expect way better performance from this SMPS then the current model and also more supplied current.

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