Marek Baczynski
1 week ago
commit
93ed93633d
@ -0,0 +1,5 @@
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.DS_Store
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kicad/breakout-opamp-ac-2-backups
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kicad/fp-info-cache
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kicad/~breakout-opamp-ac-2.kicad_sch.lck
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kicad/~breakout-opamp-ac-2.kicad_pcb.lck
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@ -0,0 +1,67 @@
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# Op-Amp AC amplifier with highpass and lowpass filters
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* For use with MCP6001 or similar amplifier
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* Works with mV inputs centered around GND
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* Few components, 0603 passives for easy soldering
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# Basic configuration
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## Behaviour:
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* 11x gain
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* Bandpass 20Hz - 15kHz (approx, not textbook perfect!)
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* Vcc 3-5V
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* Makes 10mV signal centered around GND into a 110mV signal centered around 2.5V
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* Output centered arround VCC/2
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* To directly drive headphones you must add a DC blocking capacitor! (between OUT and your headphones, 100uF should be fine)
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## Easy adjustments for people in a hurry:
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* More gain? -> Increase R2 with respect to R1
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* Pass higher frequencies? -> Reduce Clp or Rout (or both)
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* Pass lower frequencies? -> Increase both Rb+ and Rb- (same value!)
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* Lower center voltage of output? -> Increase Rb+ relative to Rb-
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* Achive the opposite of any of the above? -> Do the opposite of any of the above
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Note! The MCP6001 has a GBW of 1MHz. This means, if the gain is set to 100x, the amplifier will drop 3dB at 1MHz/100x = 10kHz! For very low input frequencies (<5Hz), you may need to increase C1 and C2.
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# Design details
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## C1, Rb+ and Rb- together form a combo bias and highpass filter
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* Since the op-amp does not have a negative voltage rail, the signal can not be less than GND
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* Therefore, the input must be biased - pulled towards some positive voltage
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* If Rb+ = Rb-, then the bias will be VCC/2 - the signal will be centered around VCC/2
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* Adjusting them relative to eachother allows you to pick a different center voltage
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* The parallel resistance of Rb+ and Rb-, together with C1 forms a HIGHPASS FILTER
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* Increasing the resistance lowers the pass frequency
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## R1 and R2 set the gain
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* Gain = R2/R1 + 1
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* Gain is limited by the GBW (gain-bandwidth product) of the op-amp used
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* MCP6001 has a GBW of 1MHz, so max frequency = 1MHz / gain (3db loss at that frequency)
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## C2 makes the output centered around the biasing frequency
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* Whatever voltage Rb+ and Rb- form, will be the center frequency of the output
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* In essance, the gain for DC is 0 (since the gain resistors R1 and R2 have not DC path to GND)
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* C2 just needs to be big enough, when it is big enough it does not affect filtering
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## Rlp and Cout can be used for an output lowpass
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* Classic low pass filter, nothing to see here
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## Rlp and Cout can instead be used for an output highpass
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* Just swap the position of the capacitor and resistor. It's ok, they fit.
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# Soldering tips
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* Solder under the stereo optical microscope
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* Start with the Op-amp
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* Then the resistors and capacitors
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* Last the pin header
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* If you make the pins face down, the PCB looks cool on a breadboard
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* If you make the pins face up, its easy to re-work the soldering
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# Simulation
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[Falstad simulation available here (https://www.falstad.com/circuit/circuitjs.html?ctz=CQAgjCAMB0l3BWEDYCYDMqDsrUE4AOLSAgsJANiSQBZ1kBTAWjDACgBDEXG8CyEOnQU+AvMijh48btAR48WAnnQIMqGpAR1Z8wnHR5IRinSxTpbAO7cN4GrzwiwDqGwBOIJ-cciCAgXJ4Dy9nV29UEkkguDYAY1CfPiTeGGlICFRoGgV-BCxVBTAcIihYDLcAc0TIghq7ALYAJUT-RJo6gJBNCS6YBGtbXmKRHiG3TzGxoVGGi1ibGfGlsH4J8bHVgTHA4IStwUjRbgQRVPL4BSvrm4UQJiyclQINCnQS9EhzuAhINmqDphAmslo1FsJjsI6gc-p4occ6Khjrs-glEQjMONhswwEj0NB+OgCAgCMIEFoaBpFGUflVupixujUKdJH8AB73KjIXgUJFKbrgOoASQAdgAHACuABcADoAZwAFgBLSoKsUcOVymUykUcEUAE3lACMlRr5XEAPYAWyNFrYHNwSE+Akw5k+9GGdQAglaxQAbJUAMyVcQ4UqVFpF9qk5jAkHoYAhcbOgpATSNTGjrGBsZ0xQEnrTRplYujefIIGI4DAdULAGElVGHRRxFTuHgkcykYWmuwOTXO2puFoTrRU01UIMDps1syROzwFg3cVhy6jvXJxyicMVzQl+B16mAPLSyWyuXBv1ShjuQbog4dYGNDk5WPyZDoYa8gU1kBHgCqAAqbD5skLi8EwphJEi5IgP4cBlL8aBsBa3DmEiBbGOIWDQGAeAdDg2D5AQvLYDStKBGwQA)]
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|
After Width: | Height: | Size: 134 KiB |
|
After Width: | Height: | Size: 3.1 MiB |
|
After Width: | Height: | Size: 237 KiB |
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After Width: | Height: | Size: 889 KiB |
File diff suppressed because it is too large
Load Diff
@ -0,0 +1,130 @@
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{
|
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"board": {
|
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"active_layer": 0,
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"active_layer_preset": "Front Layers",
|
||||
"auto_track_width": true,
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||||
"hidden_netclasses": [],
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||||
"hidden_nets": [],
|
||||
"high_contrast_mode": 0,
|
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"net_color_mode": 1,
|
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"opacity": {
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"images": 0.6,
|
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"pads": 1.0,
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"shapes": 1.0,
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"tracks": 1.0,
|
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"vias": 1.0,
|
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"zones": 0.6
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},
|
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"selection_filter": {
|
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"dimensions": true,
|
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"footprints": true,
|
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"graphics": true,
|
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"keepouts": true,
|
||||
"lockedItems": false,
|
||||
"otherItems": true,
|
||||
"pads": true,
|
||||
"text": true,
|
||||
"tracks": true,
|
||||
"vias": true,
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||||
"zones": true
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||||
},
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||||
"visible_items": [
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||||
"vias",
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||||
"footprint_text",
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||||
"footprint_anchors",
|
||||
"ratsnest",
|
||||
"footprints_front",
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"footprints_back",
|
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"footprint_values",
|
||||
"footprint_references",
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"tracks",
|
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"drc_errors",
|
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"drawing_sheet",
|
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"bitmaps",
|
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"pads",
|
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"zones",
|
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"drc_warnings",
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||||
"drc_exclusions",
|
||||
"locked_item_shadows",
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||||
"conflict_shadows",
|
||||
"shapes"
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||||
],
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||||
"visible_layers": "00000000_00000000_00000008_82002223",
|
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"zone_display_mode": 0
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},
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||||
"git": {
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||||
"repo_type": "",
|
||||
"repo_username": "",
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||||
"ssh_key": ""
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||||
},
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||||
"meta": {
|
||||
"filename": "breakout-opamp-ac-2.kicad_prl",
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||||
"version": 5
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||||
},
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||||
"net_inspector_panel": {
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||||
"col_hidden": [
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||||
false,
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||||
false,
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||||
false,
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false,
|
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false,
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false,
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false,
|
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false,
|
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false,
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false
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"col_order": [
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0,
|
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|
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],
|
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"custom_group_rules": [],
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||||
"expanded_rows": [],
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||||
"filter_by_net_name": true,
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||||
"filter_by_netclass": true,
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||||
"filter_text": "",
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||||
"group_by_constraint": false,
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||||
"group_by_netclass": false,
|
||||
"show_unconnected_nets": false,
|
||||
"show_zero_pad_nets": false,
|
||||
"sort_ascending": true,
|
||||
"sorting_column": 0
|
||||
},
|
||||
"open_jobsets": [],
|
||||
"project": {
|
||||
"files": []
|
||||
},
|
||||
"schematic": {
|
||||
"selection_filter": {
|
||||
"graphics": true,
|
||||
"images": true,
|
||||
"labels": true,
|
||||
"lockedItems": false,
|
||||
"otherItems": true,
|
||||
"pins": true,
|
||||
"symbols": true,
|
||||
"text": true,
|
||||
"wires": true
|
||||
}
|
||||
}
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||||
}
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@ -0,0 +1,611 @@
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{
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||||
"board": {
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||||
"3dviewports": [],
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||||
"design_settings": {
|
||||
"defaults": {
|
||||
"apply_defaults_to_fp_fields": false,
|
||||
"apply_defaults_to_fp_shapes": false,
|
||||
"apply_defaults_to_fp_text": false,
|
||||
"board_outline_line_width": 0.1,
|
||||
"copper_line_width": 0.2,
|
||||
"copper_text_italic": false,
|
||||
"copper_text_size_h": 1.5,
|
||||
"copper_text_size_v": 1.5,
|
||||
"copper_text_thickness": 0.3,
|
||||
"copper_text_upright": false,
|
||||
"courtyard_line_width": 0.05,
|
||||
"dimension_precision": 4,
|
||||
"dimension_units": 3,
|
||||
"dimensions": {
|
||||
"arrow_length": 1270000,
|
||||
"extension_offset": 500000,
|
||||
"keep_text_aligned": true,
|
||||
"suppress_zeroes": false,
|
||||
"text_position": 0,
|
||||
"units_format": 1
|
||||
},
|
||||
"fab_line_width": 0.1,
|
||||
"fab_text_italic": false,
|
||||
"fab_text_size_h": 1.0,
|
||||
"fab_text_size_v": 1.0,
|
||||
"fab_text_thickness": 0.15,
|
||||
"fab_text_upright": false,
|
||||
"other_line_width": 0.15,
|
||||
"other_text_italic": false,
|
||||
"other_text_size_h": 1.0,
|
||||
"other_text_size_v": 1.0,
|
||||
"other_text_thickness": 0.15,
|
||||
"other_text_upright": false,
|
||||
"pads": {
|
||||
"drill": 0.762,
|
||||
"height": 1.524,
|
||||
"width": 1.524
|
||||
},
|
||||
"silk_line_width": 0.15,
|
||||
"silk_text_italic": false,
|
||||
"silk_text_size_h": 1.0,
|
||||
"silk_text_size_v": 1.0,
|
||||
"silk_text_thickness": 0.15,
|
||||
"silk_text_upright": false,
|
||||
"zones": {
|
||||
"min_clearance": 0.2
|
||||
}
|
||||
},
|
||||
"diff_pair_dimensions": [],
|
||||
"drc_exclusions": [],
|
||||
"meta": {
|
||||
"version": 2
|
||||
},
|
||||
"rule_severities": {
|
||||
"annular_width": "error",
|
||||
"clearance": "error",
|
||||
"connection_width": "warning",
|
||||
"copper_edge_clearance": "error",
|
||||
"copper_sliver": "warning",
|
||||
"courtyards_overlap": "error",
|
||||
"creepage": "error",
|
||||
"diff_pair_gap_out_of_range": "error",
|
||||
"diff_pair_uncoupled_length_too_long": "error",
|
||||
"drill_out_of_range": "error",
|
||||
"duplicate_footprints": "warning",
|
||||
"extra_footprint": "warning",
|
||||
"footprint": "error",
|
||||
"footprint_filters_mismatch": "ignore",
|
||||
"footprint_symbol_mismatch": "warning",
|
||||
"footprint_type_mismatch": "ignore",
|
||||
"hole_clearance": "error",
|
||||
"hole_near_hole": "error",
|
||||
"hole_to_hole": "error",
|
||||
"holes_co_located": "warning",
|
||||
"invalid_outline": "error",
|
||||
"isolated_copper": "warning",
|
||||
"item_on_disabled_layer": "error",
|
||||
"items_not_allowed": "error",
|
||||
"length_out_of_range": "error",
|
||||
"lib_footprint_issues": "warning",
|
||||
"lib_footprint_mismatch": "warning",
|
||||
"malformed_courtyard": "error",
|
||||
"microvia_drill_out_of_range": "error",
|
||||
"mirrored_text_on_front_layer": "warning",
|
||||
"missing_courtyard": "ignore",
|
||||
"missing_footprint": "warning",
|
||||
"net_conflict": "warning",
|
||||
"nonmirrored_text_on_back_layer": "warning",
|
||||
"npth_inside_courtyard": "ignore",
|
||||
"padstack": "warning",
|
||||
"pth_inside_courtyard": "ignore",
|
||||
"shorting_items": "error",
|
||||
"silk_edge_clearance": "warning",
|
||||
"silk_over_copper": "warning",
|
||||
"silk_overlap": "warning",
|
||||
"skew_out_of_range": "error",
|
||||
"solder_mask_bridge": "error",
|
||||
"starved_thermal": "error",
|
||||
"text_height": "warning",
|
||||
"text_on_edge_cuts": "error",
|
||||
"text_thickness": "warning",
|
||||
"through_hole_pad_without_hole": "error",
|
||||
"too_many_vias": "error",
|
||||
"track_angle": "error",
|
||||
"track_dangling": "warning",
|
||||
"track_segment_length": "error",
|
||||
"track_width": "error",
|
||||
"tracks_crossing": "error",
|
||||
"unconnected_items": "error",
|
||||
"unresolved_variable": "error",
|
||||
"via_dangling": "warning",
|
||||
"zones_intersect": "error"
|
||||
},
|
||||
"rules": {
|
||||
"max_error": 0.005,
|
||||
"min_clearance": 0.15,
|
||||
"min_connection": 0.0,
|
||||
"min_copper_edge_clearance": 0.0,
|
||||
"min_groove_width": 0.0,
|
||||
"min_hole_clearance": 0.25,
|
||||
"min_hole_to_hole": 0.25,
|
||||
"min_microvia_diameter": 0.2,
|
||||
"min_microvia_drill": 0.1,
|
||||
"min_resolved_spokes": 2,
|
||||
"min_silk_clearance": 0.0,
|
||||
"min_text_height": 0.8,
|
||||
"min_text_thickness": 0.08,
|
||||
"min_through_hole_diameter": 0.3,
|
||||
"min_track_width": 0.15,
|
||||
"min_via_annular_width": 0.1,
|
||||
"min_via_diameter": 0.5,
|
||||
"solder_mask_clearance": 0.0,
|
||||
"solder_mask_min_width": 0.0,
|
||||
"solder_mask_to_copper_clearance": 0.0,
|
||||
"use_height_for_length_calcs": true
|
||||
},
|
||||
"teardrop_options": [
|
||||
{
|
||||
"td_onpthpad": true,
|
||||
"td_onroundshapesonly": false,
|
||||
"td_onsmdpad": true,
|
||||
"td_ontrackend": false,
|
||||
"td_onvia": true
|
||||
}
|
||||
],
|
||||
"teardrop_parameters": [
|
||||
{
|
||||
"td_allow_use_two_tracks": true,
|
||||
"td_curve_segcount": 0,
|
||||
"td_height_ratio": 1.0,
|
||||
"td_length_ratio": 0.5,
|
||||
"td_maxheight": 2.0,
|
||||
"td_maxlen": 1.0,
|
||||
"td_on_pad_in_zone": false,
|
||||
"td_target_name": "td_round_shape",
|
||||
"td_width_to_size_filter_ratio": 0.9
|
||||
},
|
||||
{
|
||||
"td_allow_use_two_tracks": true,
|
||||
"td_curve_segcount": 0,
|
||||
"td_height_ratio": 1.0,
|
||||
"td_length_ratio": 0.5,
|
||||
"td_maxheight": 2.0,
|
||||
"td_maxlen": 1.0,
|
||||
"td_on_pad_in_zone": false,
|
||||
"td_target_name": "td_rect_shape",
|
||||
"td_width_to_size_filter_ratio": 0.9
|
||||
},
|
||||
{
|
||||
"td_allow_use_two_tracks": true,
|
||||
"td_curve_segcount": 0,
|
||||
"td_height_ratio": 1.0,
|
||||
"td_length_ratio": 0.5,
|
||||
"td_maxheight": 2.0,
|
||||
"td_maxlen": 1.0,
|
||||
"td_on_pad_in_zone": false,
|
||||
"td_target_name": "td_track_end",
|
||||
"td_width_to_size_filter_ratio": 0.9
|
||||
}
|
||||
],
|
||||
"track_widths": [],
|
||||
"tuning_pattern_settings": {
|
||||
"diff_pair_defaults": {
|
||||
"corner_radius_percentage": 80,
|
||||
"corner_style": 1,
|
||||
"max_amplitude": 1.0,
|
||||
"min_amplitude": 0.2,
|
||||
"single_sided": false,
|
||||
"spacing": 1.0
|
||||
},
|
||||
"diff_pair_skew_defaults": {
|
||||
"corner_radius_percentage": 80,
|
||||
"corner_style": 1,
|
||||
"max_amplitude": 1.0,
|
||||
"min_amplitude": 0.2,
|
||||
"single_sided": false,
|
||||
"spacing": 0.6
|
||||
},
|
||||
"single_track_defaults": {
|
||||
"corner_radius_percentage": 80,
|
||||
"corner_style": 1,
|
||||
"max_amplitude": 1.0,
|
||||
"min_amplitude": 0.2,
|
||||
"single_sided": false,
|
||||
"spacing": 0.6
|
||||
}
|
||||
},
|
||||
"via_dimensions": [],
|
||||
"zones_allow_external_fillets": false
|
||||
},
|
||||
"ipc2581": {
|
||||
"dist": "",
|
||||
"distpn": "",
|
||||
"internal_id": "",
|
||||
"mfg": "",
|
||||
"mpn": ""
|
||||
},
|
||||
"layer_pairs": [],
|
||||
"layer_presets": [],
|
||||
"viewports": []
|
||||
},
|
||||
"boards": [],
|
||||
"cvpcb": {
|
||||
"equivalence_files": []
|
||||
},
|
||||
"erc": {
|
||||
"erc_exclusions": [],
|
||||
"meta": {
|
||||
"version": 0
|
||||
},
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}
|
||||
File diff suppressed because it is too large
Load Diff
Loading…
Reference in new issue