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Schematics

diqezit·schematics·FMradio/Fm_radio.kicad_pcb

Schematics PCB layout, top view — open source board by diqezit

About the Schematics PCB

Schematics is an open source PCB design by diqezit, published on GitHub. It is a 2-layer board measuring 50 × 70 mm, with 69 components from 45 distinct parts.

By type, the board carries 27 resistors, 26 capacitors, 2 inductors and 1 antenna.

It belongs with the audio and rf & radio designs in this gallery.

From the project

Discrete transistor low-IF FM receiver of medium complexity, targeting the 88-108 MHz band. Features varicap tuning, a charge-pump detector, and an LM386 amplifier. An educational DIY circuit demonstrating basic superheterodyne concepts without complex ICs (except for the audio amp) or IF coils. Best suited for local stations in low-interference

ЧМ-приёмник на дискретных транзисторах с низкой промежуточной частотой, зарядовым частотным детектором, варикапной настройкой, автоматической подстройкой частоты и УНЧ на LM386.

- Диапазон: 88-108 МГц - Питание: +9 В - Нагрузка: 8 Ом - Целевой размер платы: 50 x 70 мм - Ток покоя тракта до УНЧ: около 23 мА

1. Варикапы D1 входного контура и D5 гетеродина заменены с BB112 на BB844. Принята модель Cjo = 120 пФ, Vj = 0,75 В, M = 1,35. Расчётная кривая C(V) сверена с опорной таблицей, отклонение меньше 1 %. 2. Транзистор гетеродина 2N5401 заменён на BFT92. Для 2N5401 с fT = 300 МГц запуска на…

Schematics, from the project README
From the project README

Schematics bill of materials (BOM)

69 components, 45 distinct parts.

QtyPartRefs
1
Antenna
AE1
1
8R
BA1
1
BB910
CD1
1
LM386
DA2
2
1N4148
VD1, VD2
1
KB168_NM
VD3
1
BZX55C3V3
VD4
2
2N3906
VT1, VT6
1
S9018
VT2
3
BC547
VT3, VT4, VT5
1
6T
L1
1
5T
L2
2
10u
C1, C7
4
100n
C2, C21, C24, C25
1
47
C3
2
22u
C4, C11
2
220u
C5, C12
3
1n
C6, C15, C20
2
3.3n
C8, C9
1
39
C10
Show 25 more
QtyPartRefs
3
10n
C13, C17, C22
1
8/30pF
C14
1
47n
C16
1
0.1
C18
1
8.2p
C19
1
36
C23
1
4.7u
C26
2
1k
R1, R27
1
22
R2
3
470
R3, R14, R19
1
6.8k
R4
2
3k
R5, R10
1
620
R6
3
10k
R7, R15, R22
1
2.2k
R8
1
47k
R9
1
33
R11
1
100k
R12
1
33k
R13
2
10k
R16, R21
1
10
R17
1
20k
R18
2
30k
R20, R24
1
680
R23
2
15k
R25, R26

Schematics design files

The KiCad project lives in the diqezit/schematics repository on GitHub; these links point at the commit this page was built from.

Schematics: common questions

How big is the Schematics PCB?

The Schematics measures 50 × 70 mm, has 2 copper layers and is 1.599975 mm thick.

How many components are on the Schematics?

69 components, from 45 distinct parts. The full bill of materials is listed on this page.

Where can I download the Schematics design files?

From the diqezit/schematics repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Schematics design in my own project?

The repository has no license, so all rights stay with diqezit. Use it as a reference, and ask the author before reusing the design.

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