ain_4
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ain_4 [2016/08/10 16:25] – [Standalone use] latigid_on | ain_4 [2016/08/18 09:36] (current) – [Standalone use] latigid_on | ||
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====== AIN_4 module ====== | ====== AIN_4 module ====== | ||
- | This is a simple way of scaling CVs (as might come from a modular) ready for an STM322F4 | + | This is a simple way of scaling CVs (as might come from a modular) ready for an STM32F4 |
===== Schematic ===== | ===== Schematic ===== | ||
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The circuit is a very simple series of two inverting amplifiers per channel. The first is a TL072 powered from +12/-12V, while the second is an MCP6002 powered from 3v3/0V (ground). It's possible to preset the ranges (see below) but it's probably more useful to use the associated [[Control Board]]. | The circuit is a very simple series of two inverting amplifiers per channel. The first is a TL072 powered from +12/-12V, while the second is an MCP6002 powered from 3v3/0V (ground). It's possible to preset the ranges (see below) but it's probably more useful to use the associated [[Control Board]]. | ||
- | For bipolar operation, a +5V reference may be switched in. The output of the first stage is interrupted by a pot in order to attenuate the signal. The second stage has variable | + | For bipolar operation, a +5V reference may be switched in. The output of the first stage is interrupted by a pot in order to attenuate the signal. The second stage has switchable |
+ | |||
+ | Note the gain calculation, | ||
---- | ---- | ||
- | ===== BOM ===== | + | ===== BOM v1.2 ===== |
^Type | ^Type | ||
^resistors^ | ^resistors^ | ||
- | | | + | | |
- | | | + | | |
^capacitors^ | ^capacitors^ | ||
- | | |4|10p|025X050|C1, | + | | |4|10p|025X050|C1, |
| |9|100n|025X050|C10, | | |9|100n|025X050|C10, | ||
| |3|10u|electrolytic 2,5-6|C9, C11, C19|remove 1 if powering from Core| | | |3|10u|electrolytic 2,5-6|C9, C11, C19|remove 1 if powering from Core| | ||
| |4|optional|025X050|C2, | | |4|optional|025X050|C2, | ||
^inductors^ | ^inductors^ | ||
- | | |2|BEAD|5MM|L1, | + | | |2|BEAD|5MM|L1, |
^ICs^ | ^ICs^ | ||
| |2|MCP6002P|DIL08|IC2, | | |2|MCP6002P|DIL08|IC2, | ||
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+ | |||
+ | ===== Versions ===== | ||
+ | |||
+ | v1.2: first release. | ||
===== Assembly ===== | ===== Assembly ===== | ||
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* four 10p as marked in pink | * four 10p as marked in pink | ||
* electrolytics in yellow | * electrolytics in yellow | ||
- | * blue are optional | + | * blue are optional |
* remainder are 100n. | * remainder are 100n. | ||
{{: | {{: | ||
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* for Core power, bridge the solder jumper marked in yellow | * for Core power, bridge the solder jumper marked in yellow | ||
* otherwise install the Vreg circuit in pink | * otherwise install the Vreg circuit in pink | ||
- | * **IMPORTANT** only choose one of these 3v3 power options! Don't install the regulator if the solder | + | * **IMPORTANT** only choose one of these 3v3 power options! Don't install the regulator if the solder |
{{: | {{: | ||
+ | |||
+ | ==== Headers ==== | ||
+ | |||
+ | For connection to a [[Control Board]], use pin headers placed on the opposite side as the rest of the components i.e. follow the silkscreen markings. It's convenient to use an **unsoldered** Control Board to align all of the pins at once.\\ | ||
+ | |||
+ | For standalone use, you probably want header pins (or sockets, or even bare wires if you wish) on the same side as the remaining circuitry. | ||
+ | |||
---- | ---- | ||
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==== Standalone use ==== | ==== Standalone use ==== | ||
- | For simplest results, use the complementary [[Control Board]]. Otherwise see below for header functions. | + | For simplest results, use the complementary [[Control Board]]. Otherwise see below for header functions |
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* with a 100k pot facing you, solder the left leg to 0V(ground) | * with a 100k pot facing you, solder the left leg to 0V(ground) | ||
+ | * with the pot turned anticlockwise, | ||
* centre to WIPER | * centre to WIPER | ||
* right to LEG | * right to LEG |
ain_4.1470846357.txt.gz · Last modified: 2016/08/10 16:25 by latigid_on