Voltage-Controlled Filter PCBs - Magic Smoke Electronics

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Synthesizer Printed Circuit Boards

TH-201 "Mankato" Voltage-Controlled Filter / Oscillator / Slew Limiter

TH-201/4 Mankato (rendering).
[VIEW LARGER]

Designed by well known synth DIY guru Thomas Henry, the TH-201 is a low-pass VCF with some unusual operating modes. Magic Smoke will be producing printed circuit boards (PCBs) which can provide up to eight outputs. With the Resonance control turned all the way up, these filters will self-oscillate, operating as multi-phase LFOs or VCOs.

Both DC-coupled and AC-coupled inputs are available. The DC-coupled inputs allow the TH-201 to operate as a voltage-controlled lag processor (slew limiter). All outputs are buffered and have standard 1k impedance.

The Mankato covers a very wide frequency range: from around 0.011Hz (90 seconds per cycle) to 22kHz without range switches. Changing the timing capacitors can provide extended low frequency operation. You can certainly build your Mankato with a range switch, if that's your preference. Isn't DIY great?!

The PCB is available for do-it-yourselfers. It is not difficult to build compared to other synthesizer modules, but Magic Smoke does not recommend this for your first DIY experience.

TH-201/4 configuration

12 and 24 dB/octave outputs
inverted 12 and 24 dB/octave outputs
90 degrees of phase difference between each output
quadrature sine/cosine oscillator

TH-201/8 configuration

6, 12, 18, and 24 dB/octave outputs
inverted 6, 12, 18, and 24 dB/octave outputs
45 degrees of phase difference between each output
8-phase sine wave oscillator

Documentation

TH-201 Mankato Parts List for revision 3 PCBs. [PDF, 73KB]
See the Thomas Henry designs forum on Electro-Music.com.
Check out Dave Brown's rev. 2 Mankato, a first class build. He's got excellent tips and photos. Nice work, Dave, thanks for sharing!
Also, hear sound samples made using a Mankato.

PRICING and AVAILABILITY

TH-201 PCB (printed circuit board). 4" x 5" (102mm x 127mm), double-sided, with blue solder mask. Meets RoHS standards.
Can be used to make /4, /8 or other configurations.

Revision 3 boards are in-stock and shipping.

Boards are US$20 each. Shipping and handling charges are shown, below.

SHIPPING and HANDLING
	Quantity of PCBs
Destination	1 or 2	3 or 4	6 to 8
US / Canada	$3.50	$5.50	$7.50
EU / UK / Aus	$6.50	$8.50	$10.50
Other	Please inquire.
Shipping and handling charges apply to the total quantity of PC boards in the shipment.

Send your PayPal payment to magsmoke@gmail.com. Please contact us to pay by check or money order.

stg/soundlabs offers front panels and finished modules in various formats.

Bridechamber offers MOTM-style front panels and other DIY parts.

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Specifications and prices are subject to change.