On 20/08/16 10:20, George Herold wrote:> On Friday, August 19, 2016 at 6:10:43 PM UTC-4, Phil Hobbs wrote: >>> Have you searched for PLLs and only use the VCO part of it ? >>> Unfortunately, the low pin count devices usually have internal >>> connection between the phase detector and VCO, but try to find one >>> without such internal connection. >> >> +1 >> >> The VCO of the CD4046 might be a good candidate. It's reasonably linear, though its output is a square wave whose duty cycle isn't that we'll controlled. >> >> cheers >> >> Phil Hobbs > > Yeah and the 74HC4046 is less good.For values of "less good" that are roughly speaking, awful. Very hard to get better than 10:1 ratios, vs 1000:1 with HC4046.
LM566 alternative.
Started by ●August 18, 2016
Reply by ●August 19, 20162016-08-19
Reply by ●August 20, 20162016-08-20
On Thu, 18 Aug 2016 19:38:30 -0700, the renowned Kevin Glover <kevinfglover@yahoo.com> wrote:>I have benn trying to find a decent alternative to the LM566 VCO. It >does not seem to be sold anymore at reputable sellers and the ones on >EBay (from China) I don't trust to be authentic or unrecycled. Does >anyone know of a 8 to 16 pin alternative (just square and triangle >out) that won't break the bank. >Thanks >-SlackmeisterI like the roll-your-own one with a single BJT or MOSFET and 1/2 an LM324. Triangle out from the integrator and square wave output from the comparator. You can shape the triangle wave into a facsimile of a sine wave but that gets more complex or requires trimming. ---sp -- Best regards, Spehro Pefhany Amazon link for AoE 3rd Edition: http://tinyurl.com/ntrpwu8
Reply by ●August 20, 20162016-08-20
On 20/08/2016 02:29, Clifford Heath wrote:> On 20/08/16 10:20, George Herold wrote: >> On Friday, August 19, 2016 at 6:10:43 PM UTC-4, Phil Hobbs wrote: >>>> Have you searched for PLLs and only use the VCO part of it ? >>>> Unfortunately, the low pin count devices usually have internal >>>> connection between the phase detector and VCO, but try to find one >>>> without such internal connection. >>> >>> +1 >>> >>> The VCO of the CD4046 might be a good candidate. It's reasonably >>> linear, though its output is a square wave whose duty cycle isn't >>> that we'll controlled. >>> >>> cheers >>> >>> Phil Hobbs >> >> Yeah and the 74HC4046 is less good. > > For values of "less good" that are roughly speaking, awful. > Very hard to get better than 10:1 ratios, vs 1000:1 with HC4046.I have some experience of the 74HC4046 and it's one device where there is an enormous spread in VCO characteristics amongst manufacturers. In the end I tested a few and settled on what is now NXP. YMMV -- Mike Perkins Video Solutions Ltd www.videosolutions.ltd.uk
Reply by ●August 20, 20162016-08-20
Kevin Glover schrieb:> I have benn trying to find a decent alternative to the LM566 VCO. It > does not seem to be sold anymore at reputable sellers and the ones on > EBay (from China) I don't trust to be authentic or unrecycled. Does > anyone know of a 8 to 16 pin alternative (just square and triangle > out) that won't break the bank.You might have a look at the LM331 also. Tilmann
Reply by ●August 20, 20162016-08-20
"Kevin Glover" wrote in message news:h1scrbh3b2khj2hpfnbfijj1vr6edv9h6h@4ax.com...> I have benn trying to find a decent alternative to the LM566 VCO. It does > not seem to be sold anymore at reputable sellers and the ones on EBay > (from China) I don't trust to be authentic or unrecycled. Does anyone know > of a 8 to 16 pin alternative (just square and triangle out) that won't > break the bank.> Thanks > -SlackmeisterI think I have one or two tubes of Teledyne 9400CJ which are probably equivalent to the Microchip part TC9400. It is a 14 pin IC and good from DC to 100 kHz. I found this datasheet for the LM566 as parts inventory at msu.edu: https://www.egr.msu.edu/eceshop/Parts_Inventory/datasheets/lm566.pdf The TC9400: http://ww1.microchip.com/downloads/en/DeviceDoc/21483d.pdf It's available from Mouser for about $9: http://www.mouser.com/ProductDetail/Microchip-Technology/TC9400CPD/?qs=sGAEpiMZZMuYYilu8wI%252bZ8hERa3rWPKvbXhFsjlaxFE%3d I also might have some Analog Devices AD537, also from Mouser for $67 each (gold plated)! http://www.mouser.com/ProductDetail/Analog-Devices/AD537JD/?qs=sGAEpiMZZMv9Q1JI0Mo%2ftXXGwciEHipU http://www.mouser.com/ds/2/609/AD537-877110.pdf You might also look at LM331: http://www.ti.com/lit/ds/symlink/lm331.pdf and KA331 (Only about $0.50 at Mouser) http://www.mouser.com/ds/2/149/KA331-58235.pdf email: paul at pstech-inc dot com Paul
Reply by ●August 20, 20162016-08-20
On Fri, 19 Aug 2016 23:25:23 -0400, Spehro Pefhany <speffSNIP@interlogDOTyou.knowwhat> wrote:>On Thu, 18 Aug 2016 19:38:30 -0700, the renowned Kevin Glover ><kevinfglover@yahoo.com> wrote: > >>I have benn trying to find a decent alternative to the LM566 VCO. It >>does not seem to be sold anymore at reputable sellers and the ones on >>EBay (from China) I don't trust to be authentic or unrecycled. Does >>anyone know of a 8 to 16 pin alternative (just square and triangle >>out) that won't break the bank. >>Thanks >>-Slackmeister > >I like the roll-your-own one with a single BJT or MOSFET and 1/2 an >LM324. Triangle out from the integrator and square wave output from >the comparator. You can shape the triangle wave into a facsimile of a >sine wave but that gets more complex or requires trimming. > >---spThat's sort of the way I'd do it... except I'd use a package of LM339's and make good triangles, and linear frequency versus voltage, with current mirror control. You can simply add current mirrors to a 555 and attain the same thing more simply... but it's forbidden to even mention a 555 Timer on this newsgroup >:-} ...Jim Thompson -- | James E.Thompson | mens | | Analog Innovations | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | San Tan Valley, AZ 85142 Skype: Contacts Only | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | I'm looking for work... see my website.
Reply by ●August 20, 20162016-08-20
On Sat, 20 Aug 2016 06:34:03 -0700 Jim Thompson <To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> wrote in Message id: <3tmgrb1bhivi4ck730lr7acnsunehb69so@4ax.com>:>On Fri, 19 Aug 2016 23:25:23 -0400, Spehro Pefhany ><speffSNIP@interlogDOTyou.knowwhat> wrote: > >>On Thu, 18 Aug 2016 19:38:30 -0700, the renowned Kevin Glover >><kevinfglover@yahoo.com> wrote: >> >>>I have benn trying to find a decent alternative to the LM566 VCO. It >>>does not seem to be sold anymore at reputable sellers and the ones on >>>EBay (from China) I don't trust to be authentic or unrecycled. Does >>>anyone know of a 8 to 16 pin alternative (just square and triangle >>>out) that won't break the bank. >>>Thanks >>>-Slackmeister >> >>I like the roll-your-own one with a single BJT or MOSFET and 1/2 an >>LM324. Triangle out from the integrator and square wave output from >>the comparator. You can shape the triangle wave into a facsimile of a >>sine wave but that gets more complex or requires trimming. >> >>---sp > >That's sort of the way I'd do it... except I'd use a package of >LM339's and make good triangles, and linear frequency versus voltage, >with current mirror control. > >You can simply add current mirrors to a 555 and attain the same thing >more simply... but it's forbidden to even mention a 555 Timer on this >newsgroup >:-}That's complete BS. ;)
Reply by ●July 28, 20222022-07-28
On Friday, 19 August 2016 at 04:38:37 UTC+2, Kevin Glover wrote:> I have benn trying to find a decent alternative to the LM566 VCO. It > does not seem to be sold anymore at reputable sellers and the ones on > EBay (from China) I don't trust to be authentic or unrecycled. Does > anyone know of a 8 to 16 pin alternative (just square and triangle > out) that won't break the bank. > Thanks > -SlackmeisterI have just seen your message. just thinking. Would it not be possible to use a LM565 's VCO. Would have to design a small board to fit the LM566 socket. If you could find them? also discontinued.
Reply by ●July 28, 20222022-07-28
On Friday, 19 August 2016 at 04:38:37 UTC+2, Kevin Glover wrote:> I have benn trying to find a decent alternative to the LM566 VCO. It > does not seem to be sold anymore at reputable sellers and the ones on > EBay (from China) I don't trust to be authentic or unrecycled. Does > anyone know of a 8 to 16 pin alternative (just square and triangle > out) that won't break the bank. > Thanks > -SlackmeisterI see i have two unused NE566E's.
Reply by ●July 28, 20222022-07-28
On Wed, 27 Jul 2022 23:27:48 -0700 (PDT), Paul Badenhorst <paulbpb@gmail.com> wrote:>On Friday, 19 August 2016 at 04:38:37 UTC+2, Kevin Glover wrote: >> I have benn trying to find a decent alternative to the LM566 VCO. It >> does not seem to be sold anymore at reputable sellers and the ones on >> EBay (from China) I don't trust to be authentic or unrecycled. Does >> anyone know of a 8 to 16 pin alternative (just square and triangle >> out) that won't break the bank. >> Thanks >> -Slackmeister >I see i have two unused NE566E's.Now all you need is a time machine to transport them back to 2016. RL
