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Jasper Wasp Clone

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Description
Electronically it's almost identical to the original Wasp, but I had to change some component values for it to work with 1M potentiometers (the original used a number of 2M2 pots - not common now). Also the keyboard sense circuit had to be altered to make it work with a new TI CD4069 chip. There are some extra decoupling caps on some of the ICs and LM386. It also uses an MCP1702-5002 LDO voltage regulator in order to work even longer on batteries. Without the speaker active, it draws about 30-40mA, and about 120mA when driving a speaker.

There are a few extras on the PCB:

Notch filter setting. There are a pair of unused CD4069 units in the filter I used to implement a notch filter, like Juergen Haible's Wasp filter clone.

Buffered audio input. This uses a pair of unused CD4069 units on the right hand side to implement a buffer with variable gain that can be mixed with the two oscillators and noise.

Oscillator volume pot headers - like the Wasp deluxe. These fit via flying wires to the panel, or can be jumpered as on my prototype.

'Enhanced' waveform option headers: like the Gnat. This is a PWMed pulse wave with a fixed LFO made using a single 4069.

Two of these are on a small PCB, and connect with flying wires to the main board. I'm awaiting delivery of this prototype PCB.

The headers for this are kludged onto my prototype board, but are included if I make another set of boards.

Two 4x AA battery holders with PCB pins can be attached underneath the PCB. Intended for use with 8x NiMh batteries.

The Link port is implemented using 8pin mini-DIN cables and sockets. These are easily available, and save confusing Link with MIDI. I made an option of using the spare wire to carry power - so Jasper can power other devices using the Link port.

I've got an unfinished control panel and bottom plate in a CAD program - haven't decided whether to use an aluminium panel, or use laser etched/cut wood or acrylic. The PCB should work OK in different styles of enclosure - it is 250mm x 398mm.

There's no MIDI on the PCB - but it should be straightforward enough to make a simple MIDI-Link controller using a microcontroller.
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Technical Specifications
Type: Analog
Synthesis: Subtractive
Oscillators
Oscillators: 2
Waveforms: Pulse Variable, Saw Up, Square, White Noise
Osc Modulation: Envelope, Glide / Portamento, Keyboard, LFO
Envelopes
Envelopes: 2
Evelope Paramerters: Delay, Attack, Decay, Looping
Filters
Filters: 1
Types: Band Pass, High Pass, Low Pass, Notch, Resonance
Filter Modulation: Envelope, Keyboard, LFO
LFO
LFO: 1
LFO Parameters: Noise, Sample & Hold, Saw Up, Saw Down, Square, Triangle
Polyphony & Tuning
Polyphony: 1
Timbrality: 1
Tuning: Standard
Modes: Mono
Case
Case: Keyboard
Keyboard: 25 keys, Touch Plates, Plastic
Controls: Buttons, Switches
Connections
Audio Output Connections: 1/8" Phone Jack, Mono Out
Audio Output Count: 1
Inputs: 1
MIDI Ports: IN
Power: DC
Production
Year Released: 2016

Product Links
Company Product Sites:
[+] www.dsl-man.de
Pricing
MSRP List Price: DIY Kit - convert
Used Price: $675 - convert
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References & Sources

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