This can be used for a guitar for instance. The next input is the one at switch S1 which bypasses the transistor microphone pre-amp and inputs straight into the LM386. Again, ask an expert.Īdded: From post, which inspired this design (in general though not in specific): Whereas I guess a dynamic mic doesn’t require power and would work with Ears? Or so I think I understand. So it needs phantom power, it can’t just be connected to an unpowered amp input like on Ears, unless the mic has a battery built into it. I do know the mic preamp design here is supposed to be for an electret condenser mic, which needs to be supplied with power to work. My understanding and experience is that mic levels are lower than instrument levels, which is why the mic preamp output feeds into the instrument preamp input here, but that seems at odds with the Ears thing. It’s probably a good idea to use a scope to check your settings. With an external signal source you will want to use the gain knob to get the preamp output up to around 10 Vpp, and then use the signal level knob to get the output to the right level. The output levels you get depend not only on the amplitude of the input signal but the waveform - square waves give bigger outputs than ramp waves, for instance. This module isn’t really a plug and play kind of thing. Besides going to the EF input, the instrument preamp output goes to a front panel jack, so you can use this module to feed external signals (or the front panel mic) to other modules too. And if nothing’s plugged into the input of the mic preamp it uses the condenser mic capsule mounted on the front panel! Yes, this module is always listening, so be careful what you say. If nothing’s plugged into the synth input it uses the output of the instrument preamp, and if nothing’s plugged into the input of the instrument preamp it uses the output of the mic preamp. The mic preamp is from a design by Andy Collinson (with a mod from here) while the instrument preamp is based on the one in Ken Stone’s Stomp Box Adapter. This is inspired by stripboard build, though I used different preamp circuits. Rather than try to adapt the Teledyne 1339 based design I replaced the ARP preamp with two different preamps: One to boost instrument levels to synth levels, and one to boost mic levels to instrument levels - which then goes through the other preamp as well. The ARP EF also has a preamplifier section for input of external, non-synth level signals which, of course, are what you’re going to use an EF on a lot of the time. Aside from changing the op amps to TL074 and reducing the output stage gain (which it seemed to need, maybe because it uses ☑2 V instead of the ARP’s ☑5 V) the EF core is essentially identical to the original. It is a design based on the ARP 2600 - there’s a schematic in the service manual. This is an envelope follower (EF) module in Kosmo format with mic and instrument preamplifiers. But if there are any specific questions, I’m happy to answer those. This version sounds soooooo much better than the hardware version, and is soooooo much more flexible in its configuration, that it is more worth my while to invest some more time in making that into a module than to write about the hardware version. The remaining part of the enveloper follower however suits its purpose and you probably do not need the more refined Follow-O-Matic.Īs you may know I created Vocode-O-Matic (D31) for Daisy Seed which has 31 filter bands and a very flexible modulation matrix / patch matrix. Furthermore I want to make some music with it first so that I can include it in the write up.Īfter using the hardware vocoder for a while I found that the attack pot of the envelope follower did not bring much and in a next rendition of the device could best be left out. Complex in the sense that it contains quite a few modules to realize it and explaining what they all do and how they need to be interconnected is quite a task. I have build a vocoder based on two Behringer 914 filterbanks, 14 envelope followers and two Doepfer eight channel VCAs (of which I use 14), but haven’t come round to writing about it because the circuit is quite complex.
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