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Std Edition1500 kHz Analog Spectrum AnalyzerV1
License: Public Domain
Description
Video: https://youtu.be/dkxOwAX-kz8
Simple yet fairly performant analog spectrum analyzer built using fairly easy to get parts. Input voltage sweep should be a Sawtooth with adjustable offset (center frequency) and amplitude (sweep width). Input voltage sweep is connected to the X deflection input of an oscilloscope. Output of this circuit can be amplified and peak video detected or simply connected directly to the Y deflection input of an oscilloscope. Peak output amplitude with 20 Vpp input signal is around 1,4 Vpp.
This design is more of a curiosity than a useful instrument although it may prove useful in emergency situations. I personally wanted to try to design and build an analog spectrum analyser without any ICs as a proof of concept. I would reccomend to wait for the version 2 where I want to use OPamps for LO VCO and precise sweep control, LM1496 double balanced mixer, a lot narrower crystal filter as well as a logamp detection for at least 40 dB.
Documents
AnalogSpectrumAnalyzer V1
Open in editor| ID | Name | Designator | Footprint | Quantity |
|---|---|---|---|---|
| 1 | 20p | TC2,TC1 | VARIABLE CAPACITOR | 2 |
| 2 | BAT 48 | D2,D3 | SOD-323 | 2 |
| 3 | 2MHZ | X2,X1 | OSC-49S-1 | 2 |
| 4 | Red LED | LED1,LED2 | LED0603_RED | 2 |
| 5 | 1n | C9,C7,C13 | C0201 | 3 |
| 6 | 3n3 | C8,C6 | C0201 | 2 |
| 7 | 47p | C14 | C0201 | 1 |
| 8 | 1u | C20,C11 | C0201 | 2 |
| 9 | 470p | C3 | C0201 | 1 |
| 10 | 22p | C15,C16,C19,C17 | C0201 | 4 |
| 11 | 4n7 | C4,C2 | C0201 | 2 |
| 12 | 10n | C21 | C0201 | 1 |
| 13 | 2n2 | C5 | C0201 | 1 |
| 14 | 100p | C10,C12 | C0201 | 2 |
| 15 | 100n | C1,C18 | C0201 | 2 |
| 16 | 28 uH IF filter toroid | L4 | PWRM-TH_HR610660 | 1 |
| 17 | 1N4148 | D4,D5,D1 | SOD-123FL_L2.6-W1.6-LS3.4-RD | 3 |
| 18 | BC550 | Q5,Q6,Q4,Q2,Q1,Q3 | TO-92-3_L5.1-W4.1-P1.27-L | 6 |
| 19 | BC547 | Q10 | TO-92-3_L5.1-W4.1-P1.27-L | 1 |
| 20 | BNC | RF1 | BNC-TH_DOSIN-801-0030 | 1 |
| 21 | BC557 | Q7,Q8,Q9 | TO-92-3_L4.9-W3.7-P1.27-L | 3 |
| 22 | 1k | R23,R17,R18,R20,R22,R8,R27,R29,R5 | R0201 | 9 |
| 23 | 47 | R16,R9,R2,R3 | R0201 | 4 |
| 24 | 39 | R15 | R0201 | 1 |
| 25 | 1k 2W | R14 | R0201 | 1 |
| 26 | 470 | R19,R24,R30 | R0201 | 3 |
| 27 | 1k5 | R21 | R0201 | 1 |
| 28 | 68k | R13 | R0201 | 1 |
| 29 | 22k | R12 | R0201 | 1 |
| 30 | 5k6 | R1 | R0201 | 1 |
| 31 | 4k7 | R10,R11,R26 | R0201 | 3 |
| 32 | 330 | R32,R25 | R0201 | 2 |
| 33 | 1k2 | R28 | R0201 | 1 |
| 34 | 150 | R7 | R0201 | 1 |
| 35 | 12k | R6 | R0201 | 1 |
| 36 | 56k | R4 | R0201 | 1 |
| 37 | 220 | R31 | R0201 | 1 |
| 38 | 390 | R33 | R0201 | 1 |
| 39 | 4u7 | L1 | L0402 | 1 |
| 40 | 3u3 | L2,L3 | L0402 | 2 |
| 41 | 500 | TR2 | RES-ADJ-TH_3386P | 1 |
| 42 | 10k | TR1 | RES-ADJ-TH_3386P | 1 |
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