C-Bank partly assembled
C-Bank partly assembled
The C bank I have layed out for SMD MICA capacitors from CDE (Cornell-Doubilier), a not unexpensive delight to say it politely. But good stuff is of enormous help! The 20 switching relays are of the bistable type as recommended by Norbert due to their excellent energy balance. A short pulse only is necessary to flick them and then you could turn the power off. I got a bargain on these relays but they only need 5 volt power. So I had to modify the whole power supply in order to match it to my conditions.
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C-Bank partly assembled |
C-Bank partly assembled |
The power supply for the relays requires 6 wire jumpers. The two 50pin headers are used to plug in the controller board. I left out all the measuring units for VSWR, power and frequency because I already have appropriate measuring equipment in my shack. But there is enough space on the PCB so that these funtions can easily be realised by a small additional board.
This is the list of the SMD MICA capacitors which I am using:
| Pos. | Description | Amount | SMD | Code | |
| 1 | Mouser-No.: | 598-MC12FF500J-F | 5 | 1210 | f1 |
| Article: | CDE Mica Capacitors | ||||
| Type: | 50PF 1000V 5% | ||||
| 2 | Mouser-No.: | 598-MC12ED120J-F | 5 | 1210 | C1 |
| Article: | CDE Mica Capacitors | ||||
| Type: | 12PF 500V 5% | ||||
| 3 | Mouser-No.: | 598-MC12ED240J-F | 5 | 1210 | K1 |
| Article: | CDE Mica Capacitors | ||||
| Type: | 24PF 500V 5% | ||||
| 4 | Mouser-No.: | 5982-12-500V100-F | 13 | 1210 | A2 |
| Article: | CDE Mica Capacitors | ||||
| Type: | 100pF 500Volts 5% | ||||
| 5 | Mouser-No.: | 598-MC18FD201J-F | 5 | 1812 | H2 |
| Article: | CDE Mica Capacitors | ||||
| Type: | 200PF 500V 5% | ||||
| 6 | Mouser-No.: | 598-MC18FD391J-F | 5 | 1812 | Q2 |
| Article: | CDE Mica Capacitors | ||||
| Type: | 390pF 500V 5% 1812 | ||||
| 7 | Mouser-No.: | 598-MC22FD751J-F | 5 | 2220 | X2 |
| Article: | CDE Mica Capacitors | ||||
| Type: | 750pF 500Volts 5% | ||||
| 8 | Mouser-No.: | 5982-22-1000V1500-F | 11 | 2220 | E3 |
| Article: | CDE Mica Capacitors | ||||
| Type: | 1000V 1500pF 2220 | ||||
| 9 | Mouser-No.: | 598-MC22FF122J-TF | 6 | 2220 | C3 |
| Article: | CDE Mica Capacitors | ||||
| Type: | 1200PF 1000V 5% | ||||
| 10 | Mouser-No.: | 598-MC18FD301J-F | 2 | 1812 | M2 |
| Article: | CDE Mica Capacitors | ||||
| Type: | 300pF 500V 5% 1812 | ||||
| 11 | Mouser-No.: | 598-MC18FD331J-TF | 2 | 1812 | N2 |
| Article: | CDE Mica Capacitors | ||||
| Type: | 330pF 500V 5% 1812 | ||||
| 12 | Mouser-No.: | 598-MC22FD621J-F | 3 | 2220 | V2 |
| Article: | CDE Mica Capacitors | ||||
| Type: | 620PF 500V 5% |