Difference between revisions of "Colpitts Crystal Oscillator"
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| − | [[file: | + | [[file:CP-OSC_BNC_Rev2-720px.jpg]] |
== Features == | == Features == | ||
* Colpitts Crystal Oscillator | * Colpitts Crystal Oscillator | ||
| − | * Useful for binning crystals | + | * Useful for binning crystals for use in [[Crystal Filter Design|building crystal filters]] |
| − | ** Hand select close values from a pile of crystals | + | ** Hand select close crystal frequency values from a pile of crystals |
| − | |||
* Made from junk box parts | * Made from junk box parts | ||
** (2) 2N3904 transistors | ** (2) 2N3904 transistors | ||
| Line 15: | Line 14: | ||
** May run at higher voltages, didn't tempt fate | ** May run at higher voltages, didn't tempt fate | ||
* 15mA with 4.44 MHz crystal at 12V | * 15mA with 4.44 MHz crystal at 12V | ||
| + | ** 18 mA at 14V | ||
| + | |||
| + | === Schematic === | ||
| + | |||
| + | [[file:CP_Osc_Schematic_Rev2.PNG]]] | ||
| − | == Tested With == | + | === Tested With === |
* 4.433 MHz crystal - worked | * 4.433 MHz crystal - worked | ||
| Line 24: | Line 28: | ||
== Prototype == | == Prototype == | ||
| + | [[file:Colpitts_Osc_P1780-720px.jpg]] | ||
* Cut square PCB material for raised pads | * Cut square PCB material for raised pads | ||
| − | * Build on single | + | * Build on single sided Copper clad PCB material |
* Large ground plane | * Large ground plane | ||
| Line 48: | Line 53: | ||
== tinySA Measurements of SMT Build == | == tinySA Measurements of SMT Build == | ||
| − | + | === SMT build - Rev 1 === | |
| + | |||
* 12V power | * 12V power | ||
* 4.43 MHz crystal | * 4.43 MHz crystal | ||
| − | * Measured +8. | + | * Measured +8.6 dBm into 50 ohm load |
* 40 dBm attenuator to protect tinySA | * 40 dBm attenuator to protect tinySA | ||
* [[Frequency Counter 8 Digits|8 Digits Frequency Counter]] shows 4.432298 MHz | * [[Frequency Counter 8 Digits|8 Digits Frequency Counter]] shows 4.432298 MHz | ||
| Line 68: | Line 74: | ||
* 5V Operation | * 5V Operation | ||
| + | * +4.3 dBm | ||
[[file:CP_Osc__4p43MHz_4_to_10MHz__5V_SMT_tinySA.PNG]] | [[file:CP_Osc__4p43MHz_4_to_10MHz__5V_SMT_tinySA.PNG]] | ||
| + | |||
| + | === SMT build - Rev 2 === | ||
| + | |||
| + | [[file:CP-OSC_BNC_Rev2-720px.jpg]] | ||
| + | |||
| + | * 12V power | ||
| + | * 4.43 MHz crystal | ||
| + | * Measured +7.56 dBm into 50 ohm load | ||
| + | * 20 dBm attenuator to protect tinySA | ||
| + | * BNC connector | ||
| + | |||
| + | [[file:CP_Osc_4p43MHz_4_to_30MHz_SMT_BNC_Rev2_tinySA.PNG]] | ||
| + | |||
| + | * SMA connector | ||
| + | |||
| + | [[file:CP-OSC_SMA_Rev2-720px.jpg]] | ||
| + | |||
| + | [[file:CP_Osc_4p43MHz_4_to_30MHz_SMT_SMA_Rev2_tinySA.PNG]] | ||
== W2AEW Video == | == W2AEW Video == | ||
| Line 83: | Line 108: | ||
[[file:XTAL-Osc-3.PNG]] | [[file:XTAL-Osc-3.PNG]] | ||
| − | = | + | <video type="youtube">I4bAfDu6F1k</video> |
| − | |||
| − | |||
== Assembly Sheet == | == Assembly Sheet == | ||
[[Colpitts XTAL Oscillator Rev 1 Assembly Sheet]] | [[Colpitts XTAL Oscillator Rev 1 Assembly Sheet]] | ||
| + | |||
| + | [[Colpitts XTAL Oscillator Rev 2 Assembly Sheet]] | ||
Latest revision as of 00:16, 13 October 2021
Contents
Features
- Colpitts Crystal Oscillator
- Useful for binning crystals for use in building crystal filters
- Hand select close crystal frequency values from a pile of crystals
- Made from junk box parts
- (2) 2N3904 transistors
- Standard value 1/4W resistors
- Design from Experimental Methods in RF Design - Fig 7.69
- Built by others (W2AEW, IMSAIGuy, etc)
- Runs from 4V to >16V
- May run at higher voltages, didn't tempt fate
- 15mA with 4.44 MHz crystal at 12V
- 18 mA at 14V
Schematic
]
Tested With
- 4.433 MHz crystal - worked
- 16 MHz crystal - worked
- 27 MHz crystal - didn't work
Prototype
- Cut square PCB material for raised pads
- Build on single sided Copper clad PCB material
- Large ground plane
Scope Caps
- UUT = 4.4433 MHz crystal
- 8 Digits Frequency Counter shows 4.432285 MHz
- Rigol DS1054Z - 50 MHz scope (100 MHz mod)
- UltraScope
- Waveform triangular
Prototype
SMT Build
]
tinySA Measurements of SMT Build
SMT build - Rev 1
- 12V power
- 4.43 MHz crystal
- Measured +8.6 dBm into 50 ohm load
- 40 dBm attenuator to protect tinySA
- 8 Digits Frequency Counter shows 4.432298 MHz
- 4 to 30 MHz scan
- Rich even and odd harmonic content
- -60 dBm down outside of harmonics
- 4 to 100 MHz
- 5V Operation
- +4.3 dBm
SMT build - Rev 2
- 12V power
- 4.43 MHz crystal
- Measured +7.56 dBm into 50 ohm load
- 20 dBm attenuator to protect tinySA
- BNC connector
- SMA connector
W2AEW Video
- Wes Haywood EMiRFD circuit
