Showing posts with label ALFA. Show all posts
Showing posts with label ALFA. Show all posts

Friday, November 22, 2019

ALFA RPAR AS3350D Voltage Controlled State Variable Filter In Production

For the DIYers out there.

"#AS3350D - dual voltage controlled state variable filter (SOIC-16) in production. Datasheet will be updated later."

Until then here's some info on the AS3350:

"The AS3350 is a dual voltage controlled state-variable filter intended for electronic musical instruments and other signal processing applications. Each filter provides both voltage control of center/cut-off frequency over more than 12 octaves and voltage control of Q from 1/2 to greater than 40. All control scales are exponential, allowing for easier control of the parameters over their wide range. Although the two filters are completely independent, they may be easily interconnected to form a wide variety of filter responses.

Friday, September 06, 2019

ALFA R AS3394E - mP Controllable Synthesizer Voice on a Chip

via ALFA R

"The AS3394E is a complete analog music synthesizer voice-on-a-chip intended for software control by a microprocessor system. Included inside the compact 24 pin package is fully temperature compensated, wide range, voltage controlled oscillator providing suboscillator, triangle, sawtooth, and pulse waveforms; a voltage controlled mixer for adjusting the balance between the internally generated VCO waveforms and any external signal; a dedicated four-pole low-pass voltage controlled filter with voltage controlled resonance; a modulation amount VCA for modulating the filter frequency by the triangle waveform output of the VCO; and a final VCA for allowing the output to be enveloped. Envelope control for both the VCF and final VCA may be provided by either a hardware envelope generator such as the AS3310 or through software.

Ranging between -4 and +4 volts, all eight control inputs are provided with internal very high input impedance, low bias current buffers. Thus interface to a microprocessor system may be accomplished simply with a single DAC, 4051-type CMOS multiplexer, and 8 hold capacitors.

Requiring a bare minimum of other external components, the AS3394E is ideal for polyphonic or polytimbric musical instruments featuring rich, analog sound.


- Complete synthesizer Voice on a Chip
- Sample & Hold buffers on-chip for easy interface to a uP
- Fully temperature compensated VCO
- Independently selectable VCO waveforms
- Suboscillator output
- Separate saw output
- Separate vco and filter sections allowing design flexibility
- Constant Loudness vs Resonance VCF
- Rich Sounding VCF Design
- Filter FM routing for more Timbres
- Low Noise, Low Feedthrough VCA
- Few External Components"

Wednesday, April 17, 2019

New ALFA AS3350 - CEM3350 Filter Chips Going Into Production

"#AS3350 - (dual voltage controlled state variable filter) started evaluation.
Datasheet will be provided later."

Synths that use the CEM3350 include the Rhodes Chroma, Crumar Spirit, Synton Syrinx, Digisound 80-16 Dual Resonant Filter, and Solton Programmer 24. Someone fitted this original Rev1 Prophet-10 with them as well.

Related posts:

CEM Data Sheets

CEM3350 and the Rhodes Chroma

Update: ALFA's website:

Wednesday, March 14, 2018

New CEM and SSM Chip Clones

A few new CEM and SSM chips for the DIYers out there.

First we have Latvian CEM Synth IC clones from ALFA:

AS3310 Voltage Controlled Envelope Generator. CEM3310 pin-to-pin compatible
AS3320 Voltage controlled filter. Improved CEM3320 pin-to-pin compatible
AS3330 Dual Voltage Controled Amplifier (VCA). Improved CEM3330 replacement.
AS3340, AS3345 Voltage Controlled Oscillator (VCO). CEM3340, CEM3345 pin-to-pin compatible
AS3360 Dual Voltage Controled Amplifier (VCA). CEM3360 pin-to-pin compatible
AS16M1 Serial Controlled, 16-Channel SPCO Switch

Next, Coolaudio [Behringer] announced they are working on new SSM chip clones (news via Soviet Space Child):

"Now that we have successfully cloned the famous Curtis 3340 and 3320 synth chips, we are now looking into reviving the great sounding SSM2044 and SSM2033 chips."

Sound Semiconductor recently announced the SSI2164 QUAD VCA.

And last, but definitely not least, considering, Curtis Electro Music announced the CEM3340 VCO re-issue in 2016.

For a list of CEM and SSM chips in synthesizers see Wikipedia here.

For previous posts including some with demos, see the corresponding labels below.

This post, like all posts, is an FYI that this all exists. It's up to makers and DIYers to decide where they get their chips. This post is worth reading.

Patch n Tweak
Switched On Make Synthesizer Evolution Vintage Synthesizers Creating Sound Fundlementals of Synthesizer Programming Kraftwerk

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