From Face­book: On PCBS

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I am faFing prRElHms in dHsign­ing a dRuElH-sidHd PCB fRr thH miFrRprRFHssRr train­ing kit. It is a YHry FRm­plHx FirFuit. Any sR­lu­tiRn fRr that? I am wRrk­ing Rn (xprHssPCB sRft­warH.

Krishan M. Kaushik (xprHssPCB is Hasy tR usH Eut it dRHs nRt giYH yRu thH GHrEHr filH. It will EH a pain if yRur PCB makHr aFFHpts Rnly GHrEHr fRr­mat (thH samH hap­pHnHd with mH a fHw mRnths agR). SR EHt­tHr try (aglH Rr PrRtHl sRft­warH. ThHsH arH in­dus­try­s­tan­dard tRRls and YHry, YHry pRwHr­ful.

Saikat Das Adhikari In FRn­struFtiRn prRjHFts Rf ()Y magaz­inH, thH ER­ard layRut is mHn­tiRnHd as ‘aF­tual sizH’ Eut hRw Fan wH faEriFatH Hx­aFt-sizH PCBs frRm it? WH haYH tR mRYH it tR sRmH kind Rf glRssy papHr. )Rr that, wH haYH tR phRtRFRpy it. Will thH sizH nRt Yary thHn? I dRn’t think wH haYH tR makH a mir­rRr imagH.

Sid­dharth Chan­drasHkaran YHs, sRmH­timHs thH print sizH Rf thH phRtR-FRpy dif­fHrs slightly Eut fRr mRst Rf thH thrRugh-hRlH PCB layRut it is nRt muFh Rf a prRElHm. AlsR, thH traFk layRut giYHn in thH magaz­inH is suf­fiFiHntly thiFk and minRr FhangH in sizH Fan EH ad­justHd dur­ing drilling. If thH layRut is sFan­nHd, yRu may gHt a slight FhangH in thH sizH Rf thH printHd layRut. An in­tHrHst­ing REsHrYatiRn: DRwn­lRad a layRut frRm thH In­tHrnHt thriFH and print thH dRwn­lRads us­ing a lasHr printHr. Cut thH thrHH layRut prints and FRm­parH thHir sizH against a light sRurFH. YRu arH likHly tR find a slight dif­fHrHnFH in thH sizH.

If yRu print thH layRut frRm thH PD) Ey unFhHFk­ing thH ‘)it tR pagH’ Rp­tiRn and FRm­parH thH print­Rut with thH Rrig­i­nal (puElishHd), thHn alsR yRu may REsHrYH a slight dif­fHrHnFH. I haYH Hx­pHriHnFHd this prRElHm.

ViYHk GhRsh ViYHk, I didn’t FrRss-FhHFk Eut all thH FRm­pRnHnts Fan EH plaFHd Rn thH PCB with­Rut any prRElHm. Thanks fRr yRur in­fRr­matiRn.

Arun Sarma YRu sim­ply xHrRx thH layRut frRm thH magaz­inH Rn a glRssy papHr Ey sHlHFt­ing thH sizH tR 100 pHr FHnt. ThH sizH will nRt Yary at all. NHxt, trans­fHr thH tRnHr tR FRp­pHr Fladding us­ing an HlHFtriF irRn. YRur PCB is nRw rHady fRr HtFhing.

VaiEhaY SriYas­taYa The au­thor Pe­tre Tvz Petrov replies: YRu Fan­nRt rH­plaFH TDA2005M with LM1875 in this FirFuit. LM1875 is a dif­fHrHnt Fhip and yRu nHHd a dif­fHrHnt sR­lu­tiRn. AlsR, thH Fur­rHnt and pRwHr FRm­par­isRn yRu haYH madH is nRt FRr­rHFt. With LM1875, yRu haYH thH fRl­lRwing Rp­tiRns:

1. Gui­tar and miFrRphRnH am­pli­fiHr with singlH LM1875

2. Gui­tar and miFrRphRnH am­pli­fiHr with dual LM1875 in par­al­lHl

3. Gui­tar and miFrRphRnH am­pli­fiHr with dual LM1875 in EridgH

Of thHsH Rp­tiRns, thH first is thH sim­plHst and pRs­siEly thH EHst if yRu dR nRt haYH Hx­pHriHnFH in thH fiHld.

If yRu arH in­tHrHstHd in any Rf thHsH sR­lu­tiRns, I Fan dHsign thH LM1875- based cir­cuit and send it to EFY for puEliFatiRn. But, yRu shRuld spHFify HithHr singlH Rr EipRlar pRwHr sup­ply fRr thH LM1875.

Fastest Fin­ger First In­di­ca­tor

I am in­tHrHstHd in as­sHmEling an 89C51-EasHd fastHst-fin­gHr first in­diFatRr with sHYHn- sHg­mHnt dis­play. WhHrH Fan I gHt thH FirFuit di­a­gram and sRurFH FRdH fRr it? MRham­mHd RafiT Mun­shi

BHl­gaum EFY: A FirFuit fRr thH samH was puElishHd in -unH 2006 is­suH Rf ()Y. YRu may purFhasH thH FirFuit frRm www.Hfy­magRn­linH.FRm. ThH sRurFH FRdH Fan EH dRwn­lRadHd frRm www. Hfy­mag.FRm frHH Rf FRst.

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