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STD Transmitter Tuning Aid
License: TAPR Open Hardware License
Mode: Editors' pick
- 0
Update time：
2023-12-22 21:06:19
Creation time：
2018-02-17 19:34:06
Description
This is a tuning aid, designed to assist in tuning up CW and SSB amateur radio transmitters and limiting the risk of damage by transmitting at a low duty cycle. It is similar to the "Woodpecker" Tuning Aid described in reference [2]. This design is unique in that it includes both SSB and CW tuning aid circuits in a single unit.
The design is flexible and can be assembled in different ways depending on what features are needed.
Design Drawing
schematic diagram
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| ID | Name | Designator | Footprint | Quantity | Mounted |
|---|---|---|---|---|---|
| 1 | 390 | R1,R3 | AXIAL-0.3 | 2 | Yes |
| 2 | 1u | C1 | CAP-D3.0XF1.5 | 1 | Yes |
| 3 | 0.01u | C2 | RAD-0.1 | 1 | Yes |
| 4 | 9V | V1 | 1X02_LONGPADS | 1 | Yes |
| 5 | 22 | R4 | AXIAL-0.3 | 1 | Yes |
| 6 | 100u | C3 | CAP-D3.0XF1.5 | 1 | Yes |
| 7 | 1N4148 | D2,D3,D4,D1 | DO-35 | 4 | Yes |
| 8 | SSB OUTPUT | P1 | HDR-1X2/2.54 | 1 | Yes |
| 9 | NE555P | U2 | DIP-8 | 1 | Yes |
| 10 | 1k | R6 | AXIAL-0.3 | 1 | Yes |
| 11 | 47k | R7 | AXIAL-0.3 | 1 | Yes |
| 12 | L7805ABV | U3 | TO-92 | 1 | Yes |
| 13 | 0.1u | C5,C6,C4 | RAD-0.1 | 3 | Yes |
| 14 | POWER | SW1 | HDR-1X2/2.54 | 1 | Yes |
| 15 | 2N7000 | Q1,Q2 | TO-92(TO-92-3) | 2 | Yes |
| 16 | KEYER OUTPUT | P2 | HDR-1X2/2.54 | 1 | Yes |
| 17 | 10k | R2 | RES-ADJ_3386P | 1 | Yes |
| 18 | 500K | R5,R9 | RES-ADJ_3386P | 2 | Yes |
| 19 | 10K | R8 | AXIAL-0.3 | 1 | Yes |
| 20 | 1K | R10 | AXIAL-0.3 | 1 | Yes |
| 21 | KEY | SW2 | HDR-1X2/2.54 | 1 | Yes |
| 22 | POWER | LED1 | LED-3MM/2.54 | 1 | Yes |
| 23 | 330 | R11 | AXIAL-0.3 | 1 | Yes |
| 24 | CW | SW3 | HDR-1X2/2.54 | 1 | Yes |
| 25 | TONE | SW4 | HDR-1X2/2.54 | 1 | Yes |
| 26 | 74LS13 | U1 | DIP-14 | 1 | Yes |
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