joe smith | The fastest breadboard oscillator on the mudball, EEVBlog Contest @joesmith-je3tq | Uploaded May 2020 | Updated October 2024, 5 days ago.
Link to BreakingOhmsLaw's contest thread eevblog.com/forum/projects/challenge-thread-the-fastest-breadboard-oscillator-on-the-mudball/msg3081669/#msg3081669
Link to my crystal measurements using the NanoVNA eevblog.com/forum/rf-microwave/fun-with-crystal-filters/msg3036196/#msg3036196
There's a couple of out of order snips. I was too lazy to correct them.
Contest Rules:
Build an oscillator on a breadboard, using nothing but discrete parts.
The aim is to achieve the highest frequency on the EEVblog forum. The current record holder may call himself the incumbent master oscillator for the time the record is held.
The rules:
1. No ICs (duh!)
2. No crystals / MEMS etc.
3. No soldering except to add wires to SMT parts. All electrical connections between individual parts must be made by the breadboard contacts.
4. The output signal shall be sine(-ish) and able to drive a 10k load at at least 5Volts peak to peak. UPDATE: You may deviate from this rule withitn reason.
5. Self-made discrete parts are allowed and encouraged.
6. No cheating. Drilling a hole through your workbench to connect your tracking generator to the underside of the breadboard will be frowned upon.
7. Post an image of your breadboard and counter/scope(Rule 6!) and brief info on the type of oscillator used.
8. Bonus points for nerd value (old/strange/obsolete/abused/haywire parts, exact frequencies, etc.)
EDIT: of course it is allowed to use common frequency doubling techniques, e.g. distorting and leeching harmonics. Knock yourself out.
Link to BreakingOhmsLaw's contest thread eevblog.com/forum/projects/challenge-thread-the-fastest-breadboard-oscillator-on-the-mudball/msg3081669/#msg3081669
Link to my crystal measurements using the NanoVNA eevblog.com/forum/rf-microwave/fun-with-crystal-filters/msg3036196/#msg3036196
There's a couple of out of order snips. I was too lazy to correct them.
Contest Rules:
Build an oscillator on a breadboard, using nothing but discrete parts.
The aim is to achieve the highest frequency on the EEVblog forum. The current record holder may call himself the incumbent master oscillator for the time the record is held.
The rules:
1. No ICs (duh!)
2. No crystals / MEMS etc.
3. No soldering except to add wires to SMT parts. All electrical connections between individual parts must be made by the breadboard contacts.
4. The output signal shall be sine(-ish) and able to drive a 10k load at at least 5Volts peak to peak. UPDATE: You may deviate from this rule withitn reason.
5. Self-made discrete parts are allowed and encouraged.
6. No cheating. Drilling a hole through your workbench to connect your tracking generator to the underside of the breadboard will be frowned upon.
7. Post an image of your breadboard and counter/scope(Rule 6!) and brief info on the type of oscillator used.
8. Bonus points for nerd value (old/strange/obsolete/abused/haywire parts, exact frequencies, etc.)
EDIT: of course it is allowed to use common frequency doubling techniques, e.g. distorting and leeching harmonics. Knock yourself out.
