This is a simple square wave oscillator using a 4011 NAND chip, you could of course use the TTL equivalent as well. Adjusting the resistor values will adjust the mark/space…
Author
iainhendry
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Description A very simple LED flasher circuit using an LM3909, these were great because you could connect a 1.5v battery up to them. They are hard to come by nowadays.…
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Description As you may recall the LM317 regulator is adjustable from 1.25 to about 35v. By adding 2 diodes you can drop the voltage slightly, about 0.6v of a voltage…
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Description You can, with a little modification use a 7805 regulator to generate a variable voltage output, in the example below the output can be 5v to 30v. At higher…
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Description A simple book light Schematic Bill of materials QTY PART-REFS VALUE CODE — ——— —– —- Resistors ——— 1 R1 150K 1 R2 120R 2 R3,R4 100K Capacitors ———-…
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This is a basic DC power supply using the 78XX voltage regulator. Schematic Parts List QTY PART-REFS VALUE — ——— —– Capacitors ———- 1 C1 1000uF 1 C2 100uF Integrated…