Waveform Generator Pledge: Difference between revisions

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!Method Paid
!Method Paid
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| [[User:Asj|Aaron Jackson (asj)]] || £50 || Yes || xfer "pledge sig" - confirmed
| [[User:Asj|Aaron Jackson (asj)]] || £50 || Yes || xfer "pledge sig" - (confirmed)
|-
|-
| Jon Woodcock || £25 || Yes || xfer "pledge sig" - confirmed
| Jon Woodcock || £25 || Yes || xfer "pledge sig" - (confirmed)
|-
|-
| Duncan Fyfe || £25 || Yes || xfer "pledge sig" - confirmed
| Duncan Fyfe || £25 || Yes || xfer "pledge sig" - (confirmed)
|-
|-
| Stuart Tyler || £50  || Yes || xfer "pledge sig" - confirmed
| Stuart Tyler || £50  || Yes || xfer "pledge sig" - (confirmed)
|-
|-
| Andrew Armstrong || £20 || Yes ||  xfer "pledge sig" - confirmed
| Andrew Armstrong || £20 || Yes ||  xfer "pledge sig" -  
|-
|-
| Jason Alexander || £50 || Yes || xfer "pledge sig" - confirmed
| Jason Alexander || £50 || Yes || xfer "pledge sig" - (confirmed)
|-
|-
| Steve Barnett || £25 || Yes || xfer "pledge sig" - confirmed
| Steve Barnett || £25 || Yes || xfer "pledge sig" - (confirmed)
|-
|-
| Andrew Walters || £10 || Yes || xfer "pledge sig" - confirmed
| Andrew Walters || £10 || Yes || xfer "pledge sig" - (confirmed)
|-
|-
| Sacha Playe || £50 || Yes || xfer "pledge sig" - confirmed
| Sacha Playe || £50 || Yes || xfer "pledge sig" - (confirmed)
|-
|-
| James Taylor || £20 || Yes || xfer "pledge sig" - confirmed  
| James Taylor || £20 || Yes || xfer "pledge sig" - (confirmed)
|-
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| Nottinghack || £71 || Yes ||
| Nottinghack || £71 || Yes ||

Revision as of 10:50, 20 June 2023

Currently our only working signal generator is a Farnell LFM3 from 1975. It has a number of issues:

  • Very imprecise adjustment of the frequency
  • Long periods of drift until it has warmed up
  • Switching between output ranges briefly disconnects the attenuation and destroys your circuit
  • It has no options for modulation and is only capable of sine or square waves
  • It only has a single output
  • Output impedance is either 50/600 ohm rather than the more modern standard of 50/1M ("HiZ") ohm
  • I'm surprised it still works
  • It's so old, it's available for hire as a film prop https://www.tvfilmprops.co.uk/det/3737/Farnell-LFM3-Signal-Generator/

The proposal is to purchase a Siglent SDG1062X which solves all the problems mentioned above. The total cost is just under £400. https://siglent.co.uk/product/siglent-sdg1062x-function-generator/

If we're unable to reach this target we can see if the space is willing to "top up the pledge", or change the pledge to a Siglent SDG1032X, which has much the same functionality but only capable of 30MHz instead of 60MHz. If this is necessary, we will discuss it with the people who have agreed to make a pledge, and give you the option to remove yourself from the pledge.

Pledge Tracking
Who How Much Paid Method Paid
Aaron Jackson (asj) £50 Yes xfer "pledge sig" - (confirmed)
Jon Woodcock £25 Yes xfer "pledge sig" - (confirmed)
Duncan Fyfe £25 Yes xfer "pledge sig" - (confirmed)
Stuart Tyler £50 Yes xfer "pledge sig" - (confirmed)
Andrew Armstrong £20 Yes xfer "pledge sig" -
Jason Alexander £50 Yes xfer "pledge sig" - (confirmed)
Steve Barnett £25 Yes xfer "pledge sig" - (confirmed)
Andrew Walters £10 Yes xfer "pledge sig" - (confirmed)
Sacha Playe £50 Yes xfer "pledge sig" - (confirmed)
James Taylor £20 Yes xfer "pledge sig" - (confirmed)
Nottinghack £71 Yes