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Soft Start Option

Robert Chambers All Messages By This Member #57 Hi, What are the real world possibillities here? Variac? Electronic time delay? Other? Best, RC in VT
Duncan Munro All Messages By This Member #58 Hi Robert, The driver for the feature was choke input supplies fed by vacuum tubes - these will warm up over a few seconds rather than "spike" straight away and it's a good way to soften the start. There are other soft start schemes, i.e. old schematics for linear amplifiers using a resistor in the line feed which is shorted by a relay after a couple of seconds, or the modern way of doing this with NTC thermistors. However, PSUD doesn't do an accurate model of these. Regards, Duncan
Jack Brabham - KZ5A All Messages By This Member #59 I use the? Harbach Electronics "soft start" module.
f1frv All Messages By This Member #60 hello Have a look for something simple, working for years... 73s Dom HV_supply_Low_Weight_Rev1a_Page1.png
Robert Chambers All Messages By This Member #61 Hmm..."something simple, working for years..." I've been doing that for years with a different topology/method that is also something simple: Power Amp: Two switches...switch on the filaments first, then after an appropriate delay - actually the sequence below for the Preamp, switch on the rectifier/HV. Preamp: Two switches, two powerstats (variacs), one each in front of filament and HV/rectifier trafos... Filament switch ON, power up gradually with powerstat, then... HV switch ON, count to 30 with fingers (:)), power up gradually with powerstat Works great, no PCBs, no other stuff (relays, time delay modules, etc.)! Best, 73 etc., RC ------------------------------------------------------------------------------------------------------ On Fri, 14 May 2021 08:10:14 -0700, "f1frv" <f1frv@...> wrote: hello Have a look for something simple, working for years... [1] 73s Dom Links: ------ [1] [2] /g/duncanampspsud/message/60 [3] mailto:[email protected]?subject=Re:%20Re%3A%20%5Bduncanampspsud%5D%20Soft%20Start%20Option [4] mailto:f1frv@...?subject=Private:%20Re:%20Re%3A%20%5Bduncanampspsud%5D%20Soft%20Start%20Option [5] /mt/81400426/90558 [6] /g/duncanampspsud/post [7] /g/duncanampspsud/editsub/90558 [8] mailto:[email protected] [9] /g/duncanampspsud/leave/8998765/90558/306449312/xyzzy
Dick All Messages By This Member #62 开云体育 The simplest Soft Start circuit I have seen is in the Ameritron AL-1200. 73, Dick, W1KSZ toggle quoted message Show quoted text From: [email protected] <[email protected]> on behalf of Robert Chambers <rchamber@...> Sent: Friday, May 14, 2021 4:42 PM To: [email protected] <[email protected]> Subject: Re: [duncanampspsud] Soft Start Option ? Hmm..."something simple, working for years..." I've been doing that for years with a different topology/method that is also something simple: Power Amp: Two switches...switch on the filaments first, then after an appropriate delay - actually the sequence below for the Preamp, switch on the rectifier/HV. Preamp:? Two switches, two powerstats (variacs), one each in front of filament and HV/rectifier trafos... ???? Filament switch ON, power up gradually with powerstat, then... ???? HV switch ON, count to 30 with fingers (:)), power up gradually with powerstat Works great, no PCBs, no other stuff (relays, time delay modules, etc.)! Best, 73 etc., RC ------------------------------------------------------------------------------------------------------ On Fri, 14 May 2021 08:10:14 -0700, "f1frv" <f1frv@...> wrote: > hello > Have a look for something simple, working for years... > [1] > 73s > Dom > > Links: > ------ > [1] > [2] /g/duncanampspsud/message/60 > [3] > mailto:[email protected]?subject=Re:%20Re%3A%20%5Bduncanampspsud%5D%20Soft%20Start%20Option > [4] > mailto:f1frv@...?subject=Private:%20Re:%20Re%3A%20%5Bduncanampspsud%5D%20Soft%20Start%20Option > [5] /mt/81400426/90558 > [6] /g/duncanampspsud/post > [7] /g/duncanampspsud/editsub/90558 > [8] mailto:[email protected] > [9] > /g/duncanampspsud/leave/8998765/90558/306449312/xyzzy

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