AutoLoop Wiki
Automatically tuned loop antenna for the shortwave bands
Status: Pre-Alpha
Brought to you by:
bjohan32
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V2
V2 board
This is a new and improved version of the hardware. The schematic and the hardware contains a few errors see ticket [#12] and [#10] for more information on this.
Progress
A four layer 50x50mm version of the board is now routed and completed. Will soon be sent of to itead for production.
V2 board features
- Remote controlled via TTL-level RS232 or via a bluetooth serial adapter
- 5 servo channels, two for tuning capacitors and three for azimuth, elevation and polarity.
- Power gating to the servos, allows servo power to be switched off when the servo is not moving, helps to save power when the load is low on the servos.
- 2 Auxillary power outputs (0.5A) that can be controlled from the remote control application.
- 3 analog inputs. Meter level, AF, and band voltage.
- 2 "digital" inputs, squelsh and transmit signals.
- 1 "digital" output to enable transmit
- 1 analog output for modulation
- Temperature sensor
As i draw the schematic i got infected with a mild case of feature creep and decided to add some features that are not directly related to tuning the loop antenna, but that might be nice to have anyway. Such as the modulation output and TX/RX control which together with the AF input can hopefully be used to implement modems for CW, and other digital narrow band signals.
BOM
Warning, this list could get out of date. Before using the information, please check the current version of trunk/sch/v2/AutoLoop.cmp against AutoLoop.cmp r22 The list below contains some errors see ticket [#11].
| value | refdes | footprint | elfa number | information |
|---|---|---|---|---|
| 0 | R11 | 0603 | 60-596-50 | elfa |
| 0 | R12 | 0603 | 60-596-50 | elfa |
| 0 | R13 | 0603 | 60-596-50 | elfa |
| 100 | R16 | 1206 | 60-547-08 | elfa |
| 100K | R14 | 0603 | 60-597-53 | elfa |
| 100K | R18 | 0603 | 60-597-53 | elfa |
| 100nF | C1 | 1206 | 65-724-45 | elfa |
| 100nF | C2 | 1206 | 65-724-45 | elfa |
| 10K | R1 | 0603 | 60-597-29 | elfa |
| 10K | R3 | 0603 | 60-597-29 | elfa |
| 10K | R4 | 0603 | 60-597-29 | elfa |
| 10K | R5 | 0603 | 60-597-29 | elfa |
| 10K | R7 | 0603 | 60-597-29 | elfa |
| 10K | R8 | 0603 | 60-597-29 | elfa |
| 10K | R10 | 0603 | 60-597-29 | elfa |
| 10K | R15 | 0603 | 60-597-29 | elfa |
| 10K | R17 | 0603 | 60-597-29 | elfa |
| 10K | R19 | 0603 | 60-597-29 | elfa |
| 10K | R20 | 0603 | 60-597-29 | elfa |
| 10K | R22 | 0603 | 60-597-29 | elfa |
| 10K | R23 | 0603 | 60-597-29 | elfa |
| 10K | R25 | 0603 | 60-597-29 | elfa |
| 10uH | L1 | LHQ44 | 58-661-45 | elfa |
| 2.7n | C4 | 1206 | 65-774-98 | C1206C272K5RAC C-7025 kemet |
| 2.7n | C6 | 1206 | 65-774-98 | C1206C272K5RAC C-7025 kemet |
| 2000 | R21 | 0603 | 60-597-12 | elfa |
| 200K | RV1 | POT_SMD | 64-321-32 | elfa |
| 200K | RV2 | POT_SMD | 64-321-32 | elfa |
| 232_TTL | P2 | 4x1 2.54mm | deal extreme | deal extreme |
| 30K | R6 | 0603 | 60-597-40 | elfa |
| 4.7n | C3 | 1206 | 65-724-37 | elfa |
| 4.7n | C8 | 1206 | 65-724-37 | elfa |
| 470 | R9 | 0603 | 60-596-97 | elfa |
| 7805 | U6 | DPAK | 73-131-49 | elfa |
| 7806 | U5 | TO-220F | 73-000-24 | elfa |
| ATMEGA168A-A | IC1 | TQFP-32 | 73-647-08 | elfa |
| AUX1_6V | P3 | 2x1 2.54mm | 43-716-96 | elfa or similar. |
| AUX1_BATT | P4 | 2x1 2.54mm | 43-716-96 | elfa or similar. |
| AUX2_6V | P5 | 2x1 2.54mm | 43-716-96 | elfa or similar. |
| AUX2_BATT | P6 | 2x1 2.54mm | 43-716-96 | elfa or similar. |
| BATT | P8 | 2x1 5.08mm | 48-334-06 | elfa |
| 1u | C5 | 1206 | 65-834-13 | elfa |
| 1u | C7 | 1206 | 65-834-13 | elfa |
| 1u | C11 | 1206 | 65-834-13 | elfa |
| 68u | C9 | CAP_C | 67-235-97 | elfa |
| 68u | C10 | CAP_C | 67-235-97 | elfa |
| CAPAPOL | C12 | CAP_D2 | 67-728-62 | elfa |
| 22u | D1 | SOT-23 | 70-008-74 | elfa |
| DIODE | D2 | SOT-23 | 70-008-74 | elfa |
| DIODE | D3 | SOT-23 | 70-008-74 | elfa |
| DIODE | D4 | SOT-23 | 70-008-74 | elfa |
| DIODE | D5 | SOT-23 | 70-008-74 | elfa |
| DIODE | D6 | SOT-23 | 70-008-74 | elfa |
| DIODE | D7 | SOT-23 | 70-008-74 | elfa |
| DIODE | D9 | SOT-23 | 70-008-74 | elfa |
| DIODE | D10 | SOT-23 | 70-008-74 | elfa |
| DIODE | D11 | SOT-23 | 70-008-74 | elfa |
| DIODE | D12 | SOT-23 | 70-008-74 | elfa |
| DIODE | D13 | SOT-23 | 70-008-74 | elfa |
| ISP | P7 | 3x2 2.54mm | 43-717-12 | elfa |
| LED | D8 | 1206 | 75-311-71 | elfa |
| MCP9700 | U2 | TO92 | 73-889-31 | elfa |
| NPN | Q1 | SOT-23 | 71-009-73 | elfa |
| 10K | R24 | 0603 | 60-597-29 | elfa |
| SIGNAL INPUT | P1 | 4x2 2.54mm | 43-717-20 | elfa |
| SRV_AZI | K3 | 3x1 2.54mm | 43-716-96 | elfa or similar. |
| SRV_C1 | K1 | 3x1 2.54mm | 43-716-96 | elfa or similar. |
| SRV_C2 | K2 | 3x1 2.54mm | 43-716-96 | elfa or similar. |
| SRV_ELE | K4 | 3x1 2.54mm | 43-716-96 | elfa or similar. |
| SRV_POL | K5 | 3x1 2.54mm | 43-716-96 | elfa or similar. |
| TS952 | U1 | SO-8 | 73-459-11 | elfa |
| TS952 | U4 | SO-8 | 73-459-11 | elfa |
| ULN2003A | U3 | SO-16 | 73-301-94 | elfa |
Datasheets
Here is a list of datasheets for components that might be used for the V2 board.
Opamp TS952ID
ATMega168
Voltage regulator MC78L05ABDG
Voltage regulator L78S05CV
Temp sensor MCP9700A
Darlington driver ULN2003D
Related
Tickets: #10
Tickets: #11
Tickets: #12
Tickets: #5
Tickets: #7
Wiki: Hardware
Wiki: V1
