A bare PCB for the MFOS Ring Modulator that features:
- Internal sine wave oscillator.
- Two input channels with gain of 1 to 100.
- Internal sine x channel two mode
- Channel one x channel two mode
- Channel short switch to provide squaring of a single input.
- Voltage control inputs for internal sine wave oscillator.
- Sine oscillator output.
- Make bell like tones.
- Modify the sound of instrument or vocal.
Supplied without components or instructions, Soundtronics stock all components needed to build these modules as well as fully assembled and tested versions for those who prefer not to tackle the construction.
Check out our DIY Build Pages for supporting documentation and advice.
Tutorial for the construction of the MFOS Ring Modulator PCB.
We use PCB jigs to support our PCBs plus a component forming machine to bend the leads and then crop them ready for insertion into the PCB. We then place 20 or more resistors at a time into the PCB before soldering them from the top side of the PCB. Unless you also have similar equipment, you will need to take things a bit slower using whatever techniques you are comfortable with. If you need any specific advise with how to assemble PCBs, please post a question on our forum and we will try and assist.
- You will need to be proficient at soldering small electronic components onto a PCB
- You will need to be able to identify electronics components, their value and whether it matters which way around they are inserted. Generally, it does not matter which way around resistors, presets (although it will affect whether a clockwise rotation increases or decreases the setting), ceramic, polystyrene and non-polarised electrolytic capacitors are inserted. However, Diodes (incl LEDs), IC sockets + chips, 'normal' electrolytic caps, transistors do matter and failure to insert with the correct orientation is very likely to result in one or multiple component failures when power is applied.
- You have all necessary components as defined in the MFOS technical instructions and / or the parts list from the Soundtronics kit of parts
- You will need basic electronics assembly tools such as side cutters, snipe nose pliers and a soldering iron of 15-25W or a higher power if temperature controlled (soldering iron station)
- You have access to the MFOS PCB layout schematics.
C20 will need its legs re-forming as the PCB holes pitch is rather wide for the capacitor we supply with our kits. R51 is mounted on the panel rather than the PCB.
Getting the internal oscillator to start up can be a problem. R46 is specified as 120k but we needed to change it to 100k for a +/-12V supply on one module but was fine left at 120k on another module we built.
As per standard practice, it is best to assemble the PCB by inserting / soldering components in ascending height order.
Firstly - Resistors
Then IC Sockets
... Ceramic Caps
... Transistors, Presets & Electrolytic Caps
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