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STD Loop antenna preamp TH

License: BSD

Mode: Editors' pick

Cloned from Loop antenna preamp SMD

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Update time: 2020-02-03 23:22:52
Creation time: 2019-11-09 23:46:14
Description
Based on LZ1AQ design, with significant changes: 1. Parallel transistors in the input stage, to reduce the input impedance and noise 2. Replaced the second stage with a follower. This reduces the gain to match the dynamic range of the receiver on lower frequencies. Hopefully, also improves distortions (no measurements yet). If the low input impedance is not the goal, the following parts can be left unmounted: Q3, R11, Q4, R12. R7 and R10 are replaced with 220 Ohm.
Design Drawing
schematic diagram
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ID Name Designator Footprint Quantity
1 100p C1,C2 RAD-0.1 2
2 100n C7,C8,C3,C4,C5,C6,C9,C10,C13,C15 RAD-0.1 10
3 470n C14,C11 RAD-0.1 2
4 10n C12 RAD-0.1 1
5 +13..18V P4 MKDS3/2-5.08 1
6 Header-Male-2.54_2x2 P2 HDR-TH_4PIN-V-ROW2-COL2-MALE-PITCH2.54 1
7 200 R1,R2 RES_TH_1/4W 2
8 51 R9,R8,R11,R12 RES_TH_1/4W 4
9 4k7 R5,R6 RES_TH_1/4W 2
10 1k3 R3,R4 RES_TH_1/4W 2
11 470 R7,R10,R13,R14 RES_TH_1/4W 4
12 22uH L3,L4 IND-TH_BD4.0-L10.0-P14.00-D0.6 2
13 PN2222A Q1,Q3,Q5,Q2,Q4,Q6 TO-92(TO-92-3)-2.54 6
14 LM7810 U1 TO-220-3_L10.0-W4.5-P2.54-L 1
15 270nH L1,L2 L_AXIAL_L9.5MM_D4.0MM_P5.08MM_VERTICAL_FASTRON_SMCC 2
16 MKDS3/3-5.08 P1 MKDS3/3-5.08 1
17 OUT P3 BNC_SOCKET_TYCO-AMP 1
18 BN_61_2402_TRANSFORMER T1 BN43-202_TR3 1

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