License

GPL 3.0

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Switch 5-3.3v Power Bus

5 months ago 151
  • Description
  • Documents
  • BOM
  • Attachments
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Description

Hot switch between 5v and 3.3v buses for Signal Generator by uController

For project description and firmware refer to github: https://github.com/ShaggyDog18/SignalGeneratorSD

AD98333 module generates meandre (square signal) at its VCC level. So, if VCC bus is +5V, then amplitude of the square sugnal is 5V. In some cases a signal of 3.3v may be required. There are several solution:

  1. use 3.3v power bus for entire solutoin.
  2. add 3.3v voltage regulator and switch between 5v and 3.3v power bus for entire setup (plain rough solution).
  3. add 3.3v voltage regulator and switch power bus of an output buffer (deployed).

So, I deployed option 3: added an output cascade/buffer for meander signal only based on Schmitt-trigger (74LVC1G14) which is connected right to the AD9833 out pin, and flip its power bus between 5v and 3.3v from firmware (menu).

Documents

Switch 5-3.3v Power Bus

PCB_2020-06-21_10-37-18

BOM

ID Name Designator Footprint Quantity
1 SS14 D1 SMA(DO-214AC) 1
2 100k R2,R1 R0805 2
3 BC817 T1 SOT23-BEC 1
4 1k R3 R0805 1
5 HT7333-A U2 SOT-89 1
6 10uF C2,C1 C0805 2
7 10uF 10V C3 CAP-D6.3XH5.5 1
8 HDR-F-2.54_1x2 H1 HDR-F-2.54_1X2 1
9 200 R1,R2 AXIAL-0.3 2
10 10k R3,R4 AXIAL-0.3 2
11 47к VOL,BAL ПОТЕНЦИОМЕТР B500K 2
12 47k BASS,TRBL ПОТЕНЦИОМЕТР B500K 2
13 TDA1524AP U1 DIP18 1
14 AO3401A Q2,Q1 SOT-23_L2.9-W1.3-P0.95-LS2.4-BR 2
15 0.047 C3,C7,C12,C13 RAD-0.1 4
16 74LVC1G14GW U1 SOT-353-5_L2.0-W2.1-P0.65-BR 1
17 HDR-F-2.54_1x3 H2,H2,H1 HDR-F-2.54_1X3 3
18 22*25v C1,C2 CAP-D5.0XF2.0 2
19 100*16v C4 CAP-D5.0XF2.0 1
20 0.015 C5,C6 RAD-0.1 2
21 0.1 C8,C9,C10,C11 RAD-0.1 4

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