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GPL 3.0

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ICL8038 Board 1

1 year ago 854
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Documents

Sheet_1

ICL8038 Board 1 Pcb WIP

ICL8038 Board 0 Pcb Original

BOM

ID Name Designator Footprint Quantity
1 210S-2*5P L=11.6MMGold-plated black H1 210S-2.54-2X5P 1
2 JL500-50002G01 U2 CONN-TH_2PIN-V_JL500-50002G01 1
3 BFS20,215 Q1 SOT-23-3 1
4 ICL8038 U1 DIP14 1
5 10K R1,R8 0805 2
6 Header-Male-2.54_1x3 H2 HDR-TH_3P-P2.54-V 1
7 2.7K R7 0805 1
8 100nF C9,C1,C2,C3,C5,C4,C6,C7,C8 0805 9
9 2K R10 0805 1
10 Header-Male-2.54_2x3 J1 HDR-TH_6PIN-V-ROW2-COL3-MALE-PITCH2.54 1
11 4.7 R5,R9 0805 2
12 Precision adjustable resistance 3296W-1-304(300K) PR11,PR12,PR13,PR14,PR15 RES-ADJ_3296W 5
13 1M R2 0805 1
14 82K R6 0805 1
15 1K R3,R4 0805 2
16 LL4148-C84062 D1 LL-34_L3.5-W1.5-RD 1
17 E6C0805UYAC1UDA LED1 LED-SMD_0805-R-RD 1
18 470uF C10 CAP-TH_BD8.0-P3.50-D1.0-FD 1

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Comments (5)

Dutzu Reply

Hi,
How do you select different frequencies if all timing caps (C3,C4,C5,C6) are the same value (100nF)?


Thank you.

iamkisly Reply

Hi @Dutzu
I forgot to change the values of the capacitors to the correct ones. The following values are recommended for documentation and appnote:
470n = 20Hz   - 200Hz
47n   = 200Hz - 2kHz
4.7n  = 2kHz   - 20kHz
470p = 20kHz - 200kHz
I did not measure the capacitors on the original board, but I will definitely do it this weekend, and I will make changes to the scheme.

Dutzu Reply

@kisly.va
Thanks for the clarification.
Best regards!

Здравствуйте. Возможно ли заставить эту микросхему НЕ изменять частоту при изменении формы волны и частоты заполнения?

iamkisly Reply

@sennikov2003 как я понимаю - никак. Только если к ней цеплять частотомер с обратной связью в виде цифровых сопротивлений или pwm, но тогда схема управления выйдет в несколько раз сложнее и дороже, чем сам генератор.

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