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Description

Some simple projects for beginners to try.

Featuring a basic discrete comparator circuit that is then used in a variety of projects including the EasyEDA ELECTRET_MIC_EE electret microphone and the LDREE, LDR (light dependent resistor, a.k.a photo resistor) symbols and their associated spice models.

Documents

Basic comparator circuit

Dark operated switch

LDR test

Light operated switch

555 monostable

Sound operated flash

Electret microphone model

Electret microphone model test jig

Electret microphone model subckt

Sound operated flash 02

Simple audio peak detector

Capacitive touch switch 01

Frequency to voltage converter

Wien Bridge Oscillator

BOM

ID Name Designator Quantity
1 2DC2412R Q1,Q2,Q4 3
2 DI_2N7002K M1,M2 2
3 9 V1,VBATT 2
4 100k R2,R5,R6,R7,R1,R11,R16,R14,RFILT1,RREF2,R12 11
5 1Meg R3,R4,R19 3
6 1k LOAD,R9 2
7 82k R1 1
8 BC807_16 Q3,Q5 2
9 0.5 VLIGHT_LEVEL 1
10 Ammeter A1,AFLASH 2
11 LED D1 1
12 22k RV1 1
13 120k R2 1
14 10Meg R11,R8 2
15 LDREE Rmin = 4k Rmax = 15.6Meg tc = 100m R8 1
16 50k RV1 1
17 1u C1,C2,C4,C6,C5 5
18 555 U1 1
19 10n C3,C2 2
20 390 R10 1
21 PULSE(0 1 10m 1m 100m 1p 1) VSOUND_LEVEL 1
22 V=V(hpf) B3 1
23 2.2k R3,R12 2
24 micfet J1 1
25 SIN(0 {SPL_PK} 1k) AC 1 0 VSPL 1
26 2 V2 1
27 {1/(2*pi*lf)} C2 1
28 V=V(lpf) B2 1
29 1 R2,R1 2
30 {1/(2*pi*hf)} C1 1
31 I=V(spl)*3m B1 1
32 43p C3 1
33 SIN(0 {sound_pwr} 1k) AC 1 0 VACOUSTIC_PRESSURE 1
34 ELECTRET_MIC_EE U1,U2 2
35 I=V(acoustic_input)*6.45m B1 1
36 SIN(0 {spl_pk} 1k 10m 20 ) AC 1 0 VSOUND_PRESSURE_LEVEL 1
37 100n C5,CVCC2,CVCC1 3
38 10k R13,R2,RSWOUT1,ROSC2,R10 5
39 470p COSC1,CCOUPLING1 2
40 1N4001 D1 1
41 compOC5pEE U3 1
42 1n CFILT1,C1,C7 3
43 PULSE(0 1 10u 1u 1u 200u 400u) AC 1 0 VFINGER 1
44 47k RREF1 1
45 PULSE(0 5 0 1u) V3 1
46 R={1G*(1-V(FINGER))+2} RFINGER 1
47 SCHMITTINVEE U2,U1 2
48 SINE(0 5 1k 0 0 0 1) VSIGNAL 1
49 1N4148 D2,D3,D4 3
50 20k RFCAL 1
51 1k R1,R2 2
52 10k R3 1
53 4.7k R4 1
54 100u C3 1
55 2N5639 J1 1
56 1Meg R5,R6 2
57 10u C5 1
58 BZX84-C4V7 D2 1
59 PULSE(0 15 0 1u) V1,V2 2
60 opamp5pEE U1 1
61 2k R4 1
62 PULSE(0 9 0 10u 10u 10m 300m) AC 0 VGATE 1

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