Depends on how many range selectors you got, and how quickly you want to be= able to set the frequency. Sent from my phone > On Jul 18, 2014, at 12:35, David C Brown wrote: >=20 > And a mechanical two speed drive on the knob? >=20 >=20 >> On 18 July 2014 19:40, Vitaliy M wrote: >>=20 >> A knob + range selectors (1, 10, 100, ..) >>=20 >> Sent from my phone >>=20 >>> On Jul 18, 2014, at 11:31, David C Brown wrote: >>>=20 >>> What is the classic frequency generator UI? >>>=20 >>>=20 >>>> On 18 July 2014 19:08, Vitaliy M wrote: >>>>=20 >>>> I'm assuming your device will have a digital display, for feedback? >>>>=20 >>>> What's wrong, with the "classic" frequency generator UI? >>>>=20 >>>> Sent from my phone >>>>=20 >>>>> On Jul 18, 2014, at 6:17, David C Brown wrote: >>>>>=20 >>>>> I am building a simple pulse generator using an LTC6903 "synthesiser >>>> chip" >>>>> and a few TTL chips. The range will be from about 0.1Hz to 68MHz and >> the >>>>> frequency is set, geometrically, by a 15 bit control word. I will b= e >>>>> using a PIC16F87 to control the synthesiser and drive a display. >>>>>=20 >>>>> My problem is how to set the frequency by hand using the minimum pan= el >>>>> hardware. I need control at the finest level, stepping the control >>>>> register by one but also need to be able to make large frequency shif= ts >>>>> quickly, perhaps stepping the register by 2^10 >>>>>=20 >>>>> I have studied this for some time and come up with several solutions, >> non >>>>> of them entirely satisfactory, but I would appreciate, in the first >>>>> instance, suggestions which are not influenced by my thinking. >>>>> -- >>>>> __________________________________________ >>>>> David C Brown >>>>> 43 Bings Road >>>>> Whaley Bridge >>>>> High Peak Phone: 01663 733236 >>>>> Derbyshire eMail: dcb.home@gmail.com >>>>> SK23 7ND web: www.bings-knowle.co.uk/dcb >>>>> >>>>> -- >>>>> http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive >>>>> View/change your membership options at >>>>> http://mailman.mit.edu/mailman/listinfo/piclist >>>> -- >>>> http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive >>>> View/change your membership options at >>>> http://mailman.mit.edu/mailman/listinfo/piclist >>>>=20 >>>=20 >>>=20 >>>=20 >>> -- >>> __________________________________________ >>> David C Brown >>> 43 Bings Road >>> Whaley Bridge >>> High Peak Phone: 01663 733236 >>> Derbyshire eMail: dcb.home@gmail.com >>> SK23 7ND web: www.bings-knowle.co.uk/dcb >>> >>> -- >>> http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive >>> View/change your membership options at >>> http://mailman.mit.edu/mailman/listinfo/piclist >> -- >> http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive >> View/change your membership options at >> http://mailman.mit.edu/mailman/listinfo/piclist >>=20 >=20 >=20 >=20 > --=20 > __________________________________________ > David C Brown > 43 Bings Road > Whaley Bridge > High Peak Phone: 01663 733236 > Derbyshire eMail: dcb.home@gmail.com > SK23 7ND web: www.bings-knowle.co.uk/dcb > > --=20 > http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .