latigid on

A bit harder from this side!

The DOUT R5 board has the following pinout per shift register: NC D6 D4 D2 D0 VS D7 D5 D3 D1 This needs a bit more consideration in order to connect two control boards to one SR.

Many thanks! That's a good idea for sure, but for now I prefer to keep it simple. Also attenuation to zero is much easier with a unipolar control. I don't yet know how TK will handle the software side of things and perhaps the levels will be limited in any case. Here's another installment: a control board to work with the AIN board above. My idea is to panel mount the AIN board via the pots, and have this at a right angle above. It includes: 4 sockets for AINs, connected via a ribbon to the bottom board 4 switches (ON-OFF-ON) to control the input ranges. I chose 2x 16-way IDCs which will span over two of the jumper spaces below. 4 outputs from a DOUT module. These will be either four CLOCK OUTS, or two CLOCK OUTS, one START signal and one CLOCK IN (see below). These are connected to 3.5 mm sockets but I have also used Schmitt triggers as LED drivers. The 74LVC14A chip (SMD) runs off 3.3 V but has 5V tolerant inputs, so it can be run directly from the DOUT. 1 CLOCK IN routed to two Schmitt triggers in series (logic level preserved) and the same LED as above. This is jumperable so the correct function (CLOCK IN or OUT) can be selected. I think 100k resistors should provide enough current limiting to protect the chip. The 3.3 V signal can then be connected to a DIN module for clock functions. If I've missed anything, please let me know.

Hey, is this an original build? If you want a SEQ V4, I highly doubt anybody will trade down to a non-working V3. Presumably you have a veroboard CS and not the Wilba PCB installed? The good news is that you can swap out the Core and have a V4 right away using all of the original control surface. There is a page on uCapps.de detailing the upgrade.

Now with board-mounted pots; the 1k value shouldn't significantly affect the gain factors. The pads could be bridged if they weren't needed.

Salut, tu as des pics stp?

Well... of course the pot can't drive an op amp as the impedance is too high... I'll move them to the output. Anyone know off hand recommended pot values? I.e. what's good to drive the GPIO correctly? Think again: the first op amp stage is a better place to put the pot.

I routed up a four-channel board with different power options. Just need to move a few labels around.

Seems to work in simulation. (link to Falstad)

Can the free DOUT pins be assigned to LEDs for the seven clock outs? It would be nice to have some visual indication here. My current idea is to have a front panel with the following controls: Clock out with clock led (8th socket for clock in, LED for this too?) CV in CV range switch (0-5, 0-10, -5-+5). Input attenuator for CV. Possibly this can also act as a fixed 0-5 V control (i.e. just a pot) if nothing is plugged into the CV input. Feature request: CV inputs can act as momentary or latching "switches" to enable outputs or operate internal controls. As a crude example, see Doepfer's A-151 sequential switch module. (This just distributes a signal to one of four outputs stepped through by a clock.) http://www.doepfer.de/a151.htm

Case(s) in point from MI: BAT54S diodes in Frames: Rail-to-rail op amp (AD8534) in Braids: Rail-to-rail op amp (MCP6004) in Tides (also Grids): Rail-to-rail op amp (MCP60042) in Edges: The diodes are a bit easier to integrate but their leakage current could mean the ADC inputs go a bit too far over the allowed limits. The op amps will ensure that any over/undervoltages will be clipped to the supply (3.3 V and ground) but the input range is limited to about 0.025-3.275 V, or about 0.06-3.292 for the 8534. Any preferences?

What are you looking to trade? Where are you located?

Hey FFW, Of course, I don't have to buy them. And I'm not after the BLM, so I can't fulfil your package sale. I do think it's a little wrong to profit off Smash's PCBs though, even if you add convenience for somebody. Best of luck with your sale, looks like you have a buyer already!

Hey, I ended up buying 100 from RS and giving the rest to the workshop. But thanks! :flowers:

Cheaper to buy the F4 Core from SmashTV, including shipping. STMF4 discovery is 13€ from mouser. SEQ CS PCBs are unobtainium at the moment, so you might have an angle. When I bought mine it was 30 USD.