Difference between revisions of "Colpitts Crystal Oscillator"
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** Standard value 1/4W resistors | ** Standard value 1/4W resistors | ||
* Useful for binning crystals | * Useful for binning crystals | ||
| + | ** Hand select close values from a pile of crystals | ||
| + | ** Useful for [[Crystal Filter Design|design of crystal filters] | ||
* Design from [https://www.amazon.com/Experimental-Methods-Design-ARRL-Inc/dp/087259923X Experimental Methods in RF Design] | * Design from [https://www.amazon.com/Experimental-Methods-Design-ARRL-Inc/dp/087259923X Experimental Methods in RF Design] | ||
** Built by others (W2AEW, IMSAIGuy, etc) | ** Built by others (W2AEW, IMSAIGuy, etc) | ||
Revision as of 16:56, 20 August 2021
Features
- Colpitts Crystal Oscillator
- Junkbox parts
- (2) 2N3904 transistors
- Standard value 1/4W resistors
- Useful for binning crystals
- Hand select close values from a pile of crystals
- Useful for [[Crystal Filter Design|design of crystal filters]
- Design from Experimental Methods in RF Design
- Built by others (W2AEW, IMSAIGuy, etc)
- Runs from 7V to 16V (may go higher, didn't tempt fate
- 15mA with 4.44 MHz crystal at 12V
Prototype
- Cut square PCB material for raised pads
- Build on single side Copper clad PCB material
- Large ground plane
Prototype Scope Caps
- UUT = 4.4433 MHz crystal
- Rigol DS1054Z - 59 MHz scope (100 MHz mod)
- UltraScope
- Double clock
- 8 Digits Frequency Counter shows 4.432298 MHz
W2AEW Video
- Wes Haywood EMIRFD cirvuit
PCB
