Module A-137-2 is another version of a wave multiplier. In contrast to the A-137-1 Wave Multiplier I, the A-137-2 generates four phase-shifted copies of a VCO signal applied to the audio input. The four shifted signals are added to the original signal to obtain a fat sound similar to five independent VCOs. The phase shifting is made by a simple circuit that works only for sloped signals like sawtooth, triangle or sine, but not for rectangles or pulses. The audio input signal (typically a sawtooth, triangle or sine wave from a VCO) is compared with a slowly varying control voltage (CV Shift In). The output of the comparator is a rectangle wave with variable pulse width. When the output of the comparatur is added to the input signal (a sawtooth in the example) with the correct level relation between both signals one obtains a phase shifted sawtooth. The left picture shows the incoming sawtooth wave on top. The two horizontal dashed lines (blue and orange) indicate two different comparison levels. Below the incoming sawtooth the two resulting comparator outputs (rectangle waves) and the two resulting shifted sawtooth waves are shown. It is not a "real" phase shift but an algebraic function. But the result is virtually the same. One could obtain the same function even with several comparator modules A-167 and mixers A-138a/b or polarizing mixers A-138c. But this would require a lot of modules. The module has available four manual shift controls and four control voltage inputs with attenuators for the four internal shifting circuits. Typical sources for these inputs are LFOs, VCLFOs, random voltages, envelope generators, sequencers or other control voltage sources. Internally eight single outputs are available at single pins: the four shifted signals and in addition four rectangle outputs. A corresponding breakout module with eight sockets is in the planning stage and will be released provided that there are sufficient inquiries. The original signal and the four shifted signals are equipped with internal jumpers. If external toggle switches are used instead of the jumpers each of the 5 signals can be turned on/off individually. The audio input is equipped with an attenuator to adjust the level for the right summation of the original and the comparator signals (as described above).

Product Specs

Condition:
Brand New (New)
Brand
Doepfer
Model
A-137-2 Voltage Controlled Wave Multiplier II Module
Finish
Multi
Categories
Modular Synths

About The Seller

Juno
Joined Mar 2019
London, United Kingdom

Quick
Shipper

Accepted Payment Methods

  • PayPal

Shipping Policy

Ships from London, United Kingdom to:

United Kingdom
$9.08

I will ship with tracking to the listed regions. To negotiate shipping rates to other locations, please send me a message.

Tax Policies

This shop collects taxes in the following regions:

Alabama*
Arizona*
Arkansas*
Connecticut*
District of Columbia*
Idaho*
Iowa*
Kentucky*
Minnesota*
Nebraska*
New Jersey*
New Mexico*
New York*
Ohio*
Oklahoma*
Pennsylvania*
South Carolina*
South Dakota*
Vermont*
Virginia*
Washington*
West Virginia*
Wyoming*
*State sales tax is required in this region. Learn More

Return Policy

Return Window

This product can be returned within 14 days of receipt.

General Terms

Items must be returned in original, as-shipped condition with all original packaging and no signs of use. Buyer assumes responsibility for all return shipping costs unless the item was not received as described.

Refunds

Buyer receives a full refund in their original payment method less any shipping costs.

Message Seller

Accepted Payment Methods

Checkout via PayPal
Use a PayPal account or Credit Card

Juno

London, United Kingdom
Joined: Mar 2019

Seller Achievements

Doepfer A-137-2 Voltage Controlled Wave Multiplier II Module
$94.85