Loop antenna preamp TH

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STD Loop antenna preamp TH

License: BSD

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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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BOM

BOM download Purchase Parts

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