Sometimes near enough just isn't good enough - we have to have precision. Eurorack modular synthesisers use the Volts per Octave standard for pitch control, where a change of exactly one Volt in pitch CV results in an exact one octave change in pitch from the oscillators. Even small inacurracies in voltage can lead to quite large changes in pitch, so for transposition and control voltage addition it is important to have a very accurate voltage source and adder to keep everything in tune.
The Precision Voltages can be used as a super accurate voltage source, voltage adder or both at the same time. It has two channels to which voltages representing Octaves and Notes can be added or subtracted. If there is no input to a channel then it behaves as is a voltage source, or if an input is added to that channel then it becomes a very accurate voltage summer that can add a precise voltage to the incoming voltage.
Channel A also allows an external Gate signal to be used to turn on and off voltage addition while still passing the input signal to the output unchanged. We also have a useful Combination Mode, where channel B can be added or subtracted from Channel A.
A calibration output is also included which has an accuracy of +/-0.5mV so that it can be used instead of expensive test equipment to calibrate VCO's and similar modules.
A few uses for the Precision Voltages Module
The Precision Voltages can generate extremely accurate voltages, and can also add a very accurate voltage to an incoming voltage. It can also add two (or subtract from one another) two incoming voltages and add a fixed voltage too by using the OUT channel.
Typical uses would be:
1) Feeding the output from a sequencer to the IN A, we can then either add or subtract octaves and notes to this control voltage which is routed to OUT A. This way we can very easily transpose the incoming Pitch CV up or down by both octaves and in half note increments too.
2) Adding accurate octave switching to VCO's that do not have an Octave switch. Many Eurorack VCO's (excluding the AJHSynth MiniMod VCO) only have Course and Fine Tune controls, and do not have an Octave transpose switch. To add this feature to a VCO simply patch the V/Oct CV pitch voltage to the Precision Voltage IN A and patch the Precision Voltage OUT A to the VCO 1V/Oct input - you will now have both Octave and Chromatic Note adjustment for the VCO.
3) Precision addition or subtraction of two voltages. Connect one voltage source to IN A and the second Voltage source to IN 2. Ensure that the A+/A- and B+/B- switches are centred so that no internal voltage is added to either of the incoming voltages. The COMBINATION MODE switch can be used to accurately add togther the two voltages (A+B position), or subtract one from the other (A-B position) and the resultant voltage is routed to the OUT jack.
4) Calibrating VCO's - We use the Precision Voltages Module here at AJHSynth to calibrate all of our MiniMod VCO's - yes, its accurate enough to be used as a piece of test equipment! This is the purpose of the CAL output - it uses a super accurate voltage reference and low tempco resistors to give an astonishing accuracy from 0 to 10V range of +/- 0.1mV, and this level of precision makes it perfect for calibration, or re-calibration of oscillators.
How much is my shipping?
Shipping is automatically calculated before you submit your payment information. Simply add items to your cart and proceed to the checkout page, where you'll be offered shipping options and their prices. In the UK it's normally around £4 for order values under £150, and free above that. Shipping to mainland EU is typically between £7 and £20, depending on the shipping method and the size and weight of the order.
Do you ship to my country?
Almost certainly - the site will give you an estimate of shipping costs if you add an item to the cart and then enter your country and postcode. If you have specific requirements (such as if you prefer UPS over FedEx, for example) then let us know in advance and we'll try to work something out for you.
Shipping methods
We use a combination of Parcelforce, DPD, Royal Mail and UPS for the UK, and for international orders it's either Royal Mail, UPS, DHL or FedEx depending on where you are in the world. If you have a particular preference then try to let us know BEFORE you order so we can look into it for you. Please note that there may occasionally be additional shipping charges if you live in a remote area, depending on what surcharges are applied by the shipper. We'll get in touch to discuss this with you in such cases.
Dispatch times
For UK orders, we normally dispatch the same working day if we get the order before 15:00. If you have a really urgent situation then of course drop us an email before ordering and we'll always do our absolute best to accommodate you.
For international orders, we normally dispatch the same day if we get the order before 13:00 but again, occasionally it might be the next day before we can send it out, and sometimes FedEx or UPS may come a little earlier than scheduled which would also push an order into the next day.
Shipping times
Since April 2020 the couriers we use have suspended guarantees for shipping times, so even though we're paying them for priority services - 24-48 hours for most of the world - in practice it's often an extra day on top and sometimes it can be longer.
There is absolutely nothing we can do about this unfortunately. If you are outside the UK and it's a life-or-death situation where you absolutely MUST have that passive mult for the next day then... it may be better to find a local supplier.
Saturday shipping
If you're in the UK and you order before 15:30 on a Friday then we can send something for a Saturday delivery (NB: this applies to UK mainland addresses only). The success rate with DPD is about 95% so it's worth a punt most of the time. Please note that if you select Saturday shipping on an order placed earlier in the week, we'll wait until Friday to ship it.
Pre-orders
If a product is listed as a pre-order, it means we've ordered it from the supplier but it's not physically in stock yet. The product listing will include an estimated shipping date based on the best information we have from the supplier, but do bear in mind this is subject to change and is not a guaranteed date.
If you place an order containing a mixture of in-stock and pre-order items, we'll normally hold off on shipping anything until the pre-order item(s) have arrived, rather than splitting it into multiple shipments. If you need the in-stock items sooner, we'd recommend placing separate orders. As always, please get in touch if you have questions.
Product Overview
Sometimes near enough just isn't good enough - we have to have precision. Eurorack modular synthesisers use the Volts per Octave standard for pitch control, where a change of exactly one Volt in pitch CV results in an exact one octave change in pitch from the oscillators. Even small inacurracies in voltage can lead to quite large changes in pitch, so for transposition and control voltage addition it is important to have a very accurate voltage source and adder to keep everything in tune.
The Precision Voltages can be used as a super accurate voltage source, voltage adder or both at the same time. It has two channels to which voltages representing Octaves and Notes can be added or subtracted. If there is no input to a channel then it behaves as is a voltage source, or if an input is added to that channel then it becomes a very accurate voltage summer that can add a precise voltage to the incoming voltage.
Channel A also allows an external Gate signal to be used to turn on and off voltage addition while still passing the input signal to the output unchanged. We also have a useful Combination Mode, where channel B can be added or subtracted from Channel A.
A calibration output is also included which has an accuracy of +/-0.5mV so that it can be used instead of expensive test equipment to calibrate VCO's and similar modules.
A few uses for the Precision Voltages Module
The Precision Voltages can generate extremely accurate voltages, and can also add a very accurate voltage to an incoming voltage. It can also add two (or subtract from one another) two incoming voltages and add a fixed voltage too by using the OUT channel.
Typical uses would be:
1) Feeding the output from a sequencer to the IN A, we can then either add or subtract octaves and notes to this control voltage which is routed to OUT A. This way we can very easily transpose the incoming Pitch CV up or down by both octaves and in half note increments too.
2) Adding accurate octave switching to VCO's that do not have an Octave switch. Many Eurorack VCO's (excluding the AJHSynth MiniMod VCO) only have Course and Fine Tune controls, and do not have an Octave transpose switch. To add this feature to a VCO simply patch the V/Oct CV pitch voltage to the Precision Voltage IN A and patch the Precision Voltage OUT A to the VCO 1V/Oct input - you will now have both Octave and Chromatic Note adjustment for the VCO.
3) Precision addition or subtraction of two voltages. Connect one voltage source to IN A and the second Voltage source to IN 2. Ensure that the A+/A- and B+/B- switches are centred so that no internal voltage is added to either of the incoming voltages. The COMBINATION MODE switch can be used to accurately add togther the two voltages (A+B position), or subtract one from the other (A-B position) and the resultant voltage is routed to the OUT jack.
4) Calibrating VCO's - We use the Precision Voltages Module here at AJHSynth to calibrate all of our MiniMod VCO's - yes, its accurate enough to be used as a piece of test equipment! This is the purpose of the CAL output - it uses a super accurate voltage reference and low tempco resistors to give an astonishing accuracy from 0 to 10V range of +/- 0.1mV, and this level of precision makes it perfect for calibration, or re-calibration of oscillators.
Technical Specs
Shipping Details
How much is my shipping?
Shipping is automatically calculated before you submit your payment information. Simply add items to your cart and proceed to the checkout page, where you'll be offered shipping options and their prices. In the UK it's normally around £4 for order values under £150, and free above that. Shipping to mainland EU is typically between £7 and £20, depending on the shipping method and the size and weight of the order.
Do you ship to my country?
Almost certainly - the site will give you an estimate of shipping costs if you add an item to the cart and then enter your country and postcode. If you have specific requirements (such as if you prefer UPS over FedEx, for example) then let us know in advance and we'll try to work something out for you.
Shipping methods
We use a combination of Parcelforce, DPD, Royal Mail and UPS for the UK, and for international orders it's either Royal Mail, UPS, DHL or FedEx depending on where you are in the world. If you have a particular preference then try to let us know BEFORE you order so we can look into it for you. Please note that there may occasionally be additional shipping charges if you live in a remote area, depending on what surcharges are applied by the shipper. We'll get in touch to discuss this with you in such cases.
Dispatch times
For UK orders, we normally dispatch the same working day if we get the order before 15:00. If you have a really urgent situation then of course drop us an email before ordering and we'll always do our absolute best to accommodate you.
For international orders, we normally dispatch the same day if we get the order before 13:00 but again, occasionally it might be the next day before we can send it out, and sometimes FedEx or UPS may come a little earlier than scheduled which would also push an order into the next day.
Shipping times
Since April 2020 the couriers we use have suspended guarantees for shipping times, so even though we're paying them for priority services - 24-48 hours for most of the world - in practice it's often an extra day on top and sometimes it can be longer.
There is absolutely nothing we can do about this unfortunately. If you are outside the UK and it's a life-or-death situation where you absolutely MUST have that passive mult for the next day then... it may be better to find a local supplier.
Saturday shipping
If you're in the UK and you order before 15:30 on a Friday then we can send something for a Saturday delivery (NB: this applies to UK mainland addresses only). The success rate with DPD is about 95% so it's worth a punt most of the time. Please note that if you select Saturday shipping on an order placed earlier in the week, we'll wait until Friday to ship it.
Pre-orders
If a product is listed as a pre-order, it means we've ordered it from the supplier but it's not physically in stock yet. The product listing will include an estimated shipping date based on the best information we have from the supplier, but do bear in mind this is subject to change and is not a guaranteed date.
If you place an order containing a mixture of in-stock and pre-order items, we'll normally hold off on shipping anything until the pre-order item(s) have arrived, rather than splitting it into multiple shipments. If you need the in-stock items sooner, we'd recommend placing separate orders. As always, please get in touch if you have questions.
