Elecrow allow you to have 4 boards on the one panel for $15.00 and you cut them yourself.
Eventually I got PCBWAY to accept this proposal but it took 7 emails and wasted 2 weeks of my time and so I went to Elecrow
You cannot use resistors as you don't know what current will be taken by the item you connect to each of the voltages. If you find a resistor that works for one particular device, the voltage will not be correct when you connect another device to the same output.
You just need a little...
Some manufactures trick you (like PCBWAY) into paying $53.00 instead of $10.00
That's why I deal with Elecrow who charge just $15.00 (when you cut the boards yourself).
The only way to set up a heatsink is to load the output with car lamps and add a heat-sink. If you can keep your fingers on the heat-sink for 10 minutes, it is large enough.
All this discussion misses out the most important factor:
Sizing a heatsink is a complicated calculation.
You have to know:
1. The max operating temp of the diodes
2. The thermal resistance of junction to case
3. The max air temp at which it will operate
4. The thermal resistance from case to...
That's an old design. You can get a much-simpler design.
And you can buy the whole thing on eBay for $12.00 incl a transistor tester with a screen to show you the results. And it tests resisatators, SCRs and your love potent too.
I see you have mentioned a CMOS 555 in your circuit.
The voltage across the 1k for the NPN is ZERO. That will allow a lot of current to flow and the NPN will deliver the 1 amp as expected.
Look up the data sheet for the 555.
You are wrong with your knowledge.
Build the circuit and see it does not work.
I can see it will not work.
We need 1amp , not a few hundred milliamp.
For a 555 high output, the PNP is off ????? Really !!!!!!!
This is what you look for:
High-Endurance Flash/EEPROM cell:
- 100,000 write Flash endurance
- 1,000,000 write EEPROM endurance
- Flash/Data EEPROM retention: > 40 years
You can reprogram it 100,000 times.
You can load the EEPROM 1,000,000 times.
Scopes are earthed and if you want to take any readings above earth, you need to remove the earth pin or use an adapter that does not allow the earth to pass through the adapter.