AM8008 SH05 VCO

£160.00 inc. tax

Description This is replica of the VCO in the Roland SH-5 monophonic synthesizer introduced in 1976. This was Roland first serious attempt at a more stable oscillator using a heated exponential generator and fast CA3130 Op Amps, with a separate Op Amp power supply. It was used in the SH-5 as well as the System 100 and has a 5 octave range and 4 waveforms, as well as a sync facility.

Euro Rack Module: 14HP wide
User Manual: Download PDF

The AMSynths circuit is close to the original except for a new Tempco based matched transistor pair rather than the obsolete heated uA726 chip, as the exponential generator. This improves warm up time and precision. Original components have been used, along with a few careful upgrades:

1% polystyrene integrator capacitor
SSM matched transistor pair
Precision 5V and 10V voltage references
8V regulated supply to CA3130 chips

The panel design keeps close to the original with a Pitch potentiometer with center detent, Range selection from 32' to 2', a choice of four waveforms (triangle, sawtooth, square, pulse), frequency modulation depth and pulse width depth.

We suggest using the VCO in pairs, as in the Roland SH-5, so you can use the Sync facility, which requires two patch cables. Te voltage levels of the waveforms are as follows:

Triangle is +5V to -5V
Sawtooth is 0 to +10V
Square and Pulse are 0 to +10V

PRODUCT STATUS: PRODUCTION

Please Note:
1. The VCO derives its frequency from the Doepfer keyboard bus which is in the power cable,. This can be switched off for a static VCO when used into a Ring Modulator. This is NOT a low frequency mode.

2. The VCO is calibrated for 1.00V/octave and 0V is C1 at 32Hz. You may need to recalibrate depending on the room temperature and accuracy of the keyboard CV.

3. The Pulse Width modulation input is designed for 10V signal levels.

Product Code: AM8008

Brand: AMSynths

Product Condition: New

weight: 300.0g

0 Units in Stock

Add to Cart