tag:blogger.com,1999:blog-8559314700259794131.post8332858598102924887..comments2024-03-16T17:35:18.893+01:00Comments on Eddy Bergman.com: Synthesizer Build part-16: SAMPLE and HOLD.Eddy Bergmanhttp://www.blogger.com/profile/13286799069112368259noreply@blogger.comBlogger19125tag:blogger.com,1999:blog-8559314700259794131.post-37721358528213070672023-08-30T17:34:47.737+02:002023-08-30T17:34:47.737+02:00Ja precies :) Graag gedaan.Ja precies :) Graag gedaan.Eddy Bergmanhttps://www.blogger.com/profile/13286799069112368259noreply@blogger.comtag:blogger.com,1999:blog-8559314700259794131.post-58308094063779215752023-08-30T17:18:51.114+02:002023-08-30T17:18:51.114+02:00Je bedoelt conrad.nl? ik ga het checken, dank je!
...Je bedoelt conrad.nl? ik ga het checken, dank je!<br />Tonhttps://www.blogger.com/profile/05024285632727603616noreply@blogger.comtag:blogger.com,1999:blog-8559314700259794131.post-76052821190402091762023-08-02T10:32:04.135+02:002023-08-02T10:32:04.135+02:00Ik geloof dat Conrad die chips ook heeft.Ik geloof dat Conrad die chips ook heeft.Eddy Bergmanhttps://www.blogger.com/profile/13286799069112368259noreply@blogger.comtag:blogger.com,1999:blog-8559314700259794131.post-38500606046855873842023-07-31T08:19:32.919+02:002023-07-31T08:19:32.919+02:00Oh cool! Daar verheug ik me op! Ik ben blij dat al...Oh cool! Daar verheug ik me op! Ik ben blij dat alles zo goed werkt. Eddy Bergmanhttps://www.blogger.com/profile/13286799069112368259noreply@blogger.comtag:blogger.com,1999:blog-8559314700259794131.post-11846556463815191042023-07-30T23:38:17.907+02:002023-07-30T23:38:17.907+02:00:) Ik zal binnenkort mijn project op fb posten. Er...:) Ik zal binnenkort mijn project op fb posten. Er zitten veel van jouw modules in die prima werken.Tonhttps://www.blogger.com/profile/05024285632727603616noreply@blogger.comtag:blogger.com,1999:blog-8559314700259794131.post-23234470222900382612023-07-30T08:31:15.408+02:002023-07-30T08:31:15.408+02:00Dat dacht ik al landgenoot ^____^Dat dacht ik al landgenoot ^____^Eddy Bergmanhttps://www.blogger.com/profile/13286799069112368259noreply@blogger.comtag:blogger.com,1999:blog-8559314700259794131.post-90020126474295135512023-07-30T01:59:40.290+02:002023-07-30T01:59:40.290+02:00Thank you! I am Dutch :)Thank you! I am Dutch :)Tonhttps://www.blogger.com/profile/05024285632727603616noreply@blogger.comtag:blogger.com,1999:blog-8559314700259794131.post-72602335746464846592023-07-29T17:44:18.737+02:002023-07-29T17:44:18.737+02:00You can also try ebay. These types of chips are us...You can also try ebay. These types of chips are usually okay to buy on ebay. I think I got mine there too.Eddy Bergmanhttps://www.blogger.com/profile/13286799069112368259noreply@blogger.comtag:blogger.com,1999:blog-8559314700259794131.post-87712736584936600012023-07-29T17:42:18.289+02:002023-07-29T17:42:18.289+02:00I don't know where you are located but I found...I don't know where you are located but I found a Dutch webshop that has them. Here's the link: https://nl.rs-online.com/web/p/sample-hold-circuits/1218735?gb=bEddy Bergmanhttps://www.blogger.com/profile/13286799069112368259noreply@blogger.comtag:blogger.com,1999:blog-8559314700259794131.post-34471108752586996192023-07-29T17:29:58.837+02:002023-07-29T17:29:58.837+02:00Hi Eddy the LF398 chip seems to be a bit difficult...Hi Eddy the LF398 chip seems to be a bit difficult to buy. Go you now a thrusworthy place where I can buy it?Tonhttps://www.blogger.com/profile/05024285632727603616noreply@blogger.comtag:blogger.com,1999:blog-8559314700259794131.post-72626643570257192092021-09-12T15:15:27.065+02:002021-09-12T15:15:27.065+02:00That's a very good point you're making and...That's a very good point you're making and shows my lack of understanding when I started out on this synthesizer project. I just took a practical approach which worked for my particular situation but you're right of course with the change in output impedance. I'll make a note of that in the article. Thanks for bringing it up!Eddy Bergmanhttps://www.blogger.com/profile/13286799069112368259noreply@blogger.comtag:blogger.com,1999:blog-8559314700259794131.post-69042531050860253832021-09-12T14:48:57.659+02:002021-09-12T14:48:57.659+02:00Just a quick note on the output circuit for your o...Just a quick note on the output circuit for your offset voltage corrector. You provide a switch-selected attenuator after the output of a buffering/invertting op amp. For the 0.5X switch selection this will greatly increase the output resistance of your S/H module.<br /><br />When plugged into another module with control voltage inputs with usual 100KΩ resistors, you will see a 56kΩ output resistor in series, paralleled with the 56KΩ attenuation resistor, which will scale control voltages differently than if driven directly by the op amp. What you've done for the 0.5x case is taken the low-impedance buffering ability of the last op amp out of the picture.<br /><br />What you might do instead is insert the attenuator between the offset correction op amp and the output op amp. Then the output op amp can be used directly for both 1x and 0.5x scaling. Or if you prefer a small (100Ω-1kΩ) resistor could be used to isolate the output op amp, help with potential capacitive loading of a patch cable, etc. But that won't cause a large scale error, 1kΩ << 100kΩ typically used for control voltage summers.<br /><br />raksphotohttps://www.blogger.com/profile/05585289134899483180noreply@blogger.comtag:blogger.com,1999:blog-8559314700259794131.post-77246149705084641452021-08-19T19:11:07.471+02:002021-08-19T19:11:07.471+02:00Okay good. It's quite a simple circuit so if a...Okay good. It's quite a simple circuit so if all connections are correct it must be a component failure. The only thing I added myself was the offset option and that, you mentioned, works fine so I think it almost certainly has to be the LF chip. Also make sure there are no short circuits between the strips. Eddy Bergmanhttps://www.blogger.com/profile/13286799069112368259noreply@blogger.comtag:blogger.com,1999:blog-8559314700259794131.post-87498352669176530702021-08-19T18:23:58.073+02:002021-08-19T18:23:58.073+02:00Thanks for the quick response. I already tested th...Thanks for the quick response. I already tested the input path with my multimeter and it seems okay. Next I will swap the IC and see if that changes anything. I have bought two of them as well as two of the polystyrene capacitors. I'll let you know if I get it to work. 😬knopslhttps://www.blogger.com/profile/08648882523820640748noreply@blogger.comtag:blogger.com,1999:blog-8559314700259794131.post-56992051384320384292021-08-19T15:48:57.698+02:002021-08-19T15:48:57.698+02:00Sorry you're having problems with it. You shou...Sorry you're having problems with it. You should first make sure the LF398 chip is good (try an other one if you have an other one). Otherwise, follow the input signal path through the print to make sure all the connections are as they should be. An oscilloscope would be a great help here. You can print out the schematic by Rene Schmitz and check the signal path on there and compare it with the print you built. Als make sure the 1 nF polystyrene capacitor good. Eddy Bergmanhttps://www.blogger.com/profile/13286799069112368259noreply@blogger.comtag:blogger.com,1999:blog-8559314700259794131.post-27101146036698695452021-08-19T15:40:03.131+02:002021-08-19T15:40:03.131+02:00I hear a single tone on the cv out. -> sorry I ...I hear a single tone on the cv out. -> sorry I mena always the aame CV value. It obviously doesn't output a toneknopslhttps://www.blogger.com/profile/08648882523820640748noreply@blogger.comtag:blogger.com,1999:blog-8559314700259794131.post-32331650120610904112021-08-19T15:39:02.790+02:002021-08-19T15:39:02.790+02:00Hey I built the module almost 1:1 except for some ...Hey I built the module almost 1:1 except for some minor resistor differences and I can't get it to work porperly. I hear a single tone on the cv out. The offset and the switch for the cv out work just fine. I can hear the change in sample rate but it seems like the input signal won't get sampled if that makes any sense. The output never changes when I input noise (from your noise module btw). Do you have any idea where to start debugging?knopslhttps://www.blogger.com/profile/08648882523820640748noreply@blogger.comtag:blogger.com,1999:blog-8559314700259794131.post-40836903170296791202020-11-14T14:51:07.920+01:002020-11-14T14:51:07.920+01:00Ja absoluut. Dat is de beste manier om zoiets te b...Ja absoluut. Dat is de beste manier om zoiets te bouwen. Dan kun je oof de noise intern met een schakelaartje doorverbinden naar de input van de Sample and Hold. Wel zo handig.Eddy Bergmanhttps://www.blogger.com/profile/13286799069112368259noreply@blogger.comtag:blogger.com,1999:blog-8559314700259794131.post-88013523503286185102020-11-14T14:07:26.925+01:002020-11-14T14:07:26.925+01:00Eddy, als je meer ruimte had gehad, zou je dan de ...Eddy, als je meer ruimte had gehad, zou je dan de noise module en de S&H op 1 frontplaat bouwen ?<br />rolf-electronicshttps://www.blogger.com/profile/01801866585063105835noreply@blogger.com